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Personal Submarine Cruises SF Bay

LandSonar writes "Graham Hawkes, the guru of the submarine design business, tried out his new submersible sea plane yesterday in SF Bay. Called the 'Deep Flight Aviator'. Article and cool pictures. This craft doesn't use ballast like traditional subs. Flys more like a plane. 'It looks like something NASA might build or the Blue Angels might fly.'"

277 comments

  1. Darn! by Amazing+Quantum+Man · · Score: 2, Funny

    I was hoping for something more like Sky-Diver from the old UFO series!

    --
    Fascism starts when the efficiency of the government becomes more important than the rights of the people.
    1. Re:Darn! by Anonymous Coward · · Score: 2, Funny

      Must resist, to much pressure.....subs, seamen, cruising, san francisco.........

  2. Old News by rbgaynor · · Score: 1, Funny

    Didn't NASA already build a space shuttle that traveled above and below the water? If I remember correctly it only made a single underwater trip...

    --
    "Good things don't end with eum, they end with mania or teria." - H. Simpson
    1. Re:Old News by satterth · · Score: 1
      Dude, they test most of the space equipment underwater in deep pools.

      it's one of the simpler places to test equipment for airtightness and weightlessness. Besides in a place for a few seconds.

      So, most of that shuttle has already been underwater several times.

      --
      Being called a dork on Slashdot must be like being called the retard in special ed.
    2. Re:Old News by Anonymous Coward · · Score: 0

      it was a sick joke about Challenger.

  3. Does anyone know.... by Scud_the_disposable_ · · Score: 1
    Where can I get one?

    1. Re:Does anyone know.... by Anonymous Coward · · Score: 0

      I think there's one in San Francisco that you can borrow... :)

  4. I don't know about flying.... by turtlendogrmusd.net · · Score: 2, Insightful

    I was a little disappointed to see that the term "fly" seems to describe how it moves through the water, rather indicate the capabilities of a submersible flying boat... Now that would be cool!

    1. Re:I don't know about flying.... by tdvaughan · · Score: 1

      Actually, I think this sub does support itself in the water by the Bernoulli effect.

    2. Re:I don't know about flying.... by jackb_guppy · · Score: 1

      "Flying" is how penguins are described as moving though water. So why not a sub?

      Though a better name is needed - sub is short for submersible, which sounds to be tied to dirigibles. And they both look the same and work primarily by the same methods. Creating a space that can contains a volume with a lower press enough so that if floats to up. Then adding or removing a medium in that space to change the overall density to cause the over thing to go "up" or "down".

      Here is a cool logic question...

      Is a fish and a bird actually the same creature - just one is a denser medium?

      If so, is man nothing more that crab?

  5. This thing flys? by yourmom16 · · Score: 0
    Flys more like a plane.

    Does it function above water or is this just an analogy

    --
    "We have got to make Stan understand the importance of voting, because he'll definitely vote for our guy." - South Park
    1. Re:This thing flys? by DredPirateRoberts · · Score: 1

      From the article and the pics, I'd say it's underwater only.

      --
      "All animals are created equal, but some animals are more equal than others." - George Orwell
    2. Re:This thing flys? by Anonymous Coward · · Score: 2, Funny

      In soviet russia dipshits read the article instead of posting stupid ass comments that could be answered be merely skimming it.

    3. Re:This thing flys? by Anonymous Coward · · Score: 0

      In Soviet Russia, people submit the news items to /. correctly ("submersible sea plane")

    4. Re:This thing flys? by Anonymous Coward · · Score: 0

      I think what you're looking for is "flies"

  6. Plans? by SealBeater · · Score: 2, Interesting

    So, if it's homemade, any chance of getting the plans or trying to figure it
    out? I've got a friend who can mold carbon fiber, I wouldn't mind taking a
    crack at building one or even a lesser version. How cool would it be to have
    one of these?

    SealBeater

    --
    -- Its survival of the fittest...and we got the fucking guns!!!
    1. Re:Plans? by Reality+Master+101 · · Score: 5, Funny

      Yeah! I even got a name for you: how about "The Suicide Express"? "The Widowmaker" is already so overused.

      --
      Sometimes it's best to just let stupid people be stupid.
    2. Re:Plans? by Anonymous Coward · · Score: 0

      "The Widowmaker" is already so overused.

      And this IS Slashdot, after all. Not likely to be many widows around here.

    3. Re:Plans? by Anonymous Coward · · Score: 0

      Hi,

      the plans are in our cvs, in autodesk format (please check out their site, autodesk is our sponsor), please contact our lawyer if you use our 3d designs.
      bye.

      ted

    4. Re:Plans? by Anonymous Coward · · Score: 0

      A lot of relieved gym socks and pictures of natalie portman though.

    5. Re:Plans? by Anonymous Coward · · Score: 0

      Why not call it the:

      Hunley

    6. Re:Plans? by droopus · · Score: 1

      I've got a friend who can mold carbon fiber, I wouldn't mind taking a crack at building one or even a lesser version. How cool would it be to have
      one of these?


      Whoa. You're gonna hack together a submarine?

      No offense but Graham Hawkes has been involved in building a large percentage of the world submarine fleet, and even he described building this as a challenge. Submarines are actually quite simple devices that, even if they are only going down two atmospheres (66 feet) have to be built to insanely tight tolerances with NASA-level attention to detail or there could be.... problems. In addition, they don't describe the very expensive support necessary for use of any submersible in the ocean.

      Some of the possible pitfalls of throwing together a submersible can be seen here if you really insist on trying to cobble together yer very own Red October.

      But I have to agree with you...that looks a whole lot more fun than a Segway to me. B)

      --
      "The pie shall be cut in half and each man shall receive.....death. I'll eat the pie."
    7. Re:Plans? by Anonymous Coward · · Score: 0

      ha HA. i get it! youre saying slashdot is all nerds without lady-friends and that none of us get married so we cant die and leave them as widows! ha HAHAHA....ok finished my cigarrette....back to my fiancee to continue our friday night fuck-a-thon!

    8. Re:Plans? by Anonymous Coward · · Score: 0

      natalie portman????? WHERE!!!!!??!!!!!1111111!!!one!!!1

    9. Re:Plans? by Anonymous Coward · · Score: 0

      Dear sir: if you schedule a fuck-a-thon, you are not truly having a fuck-a-thon.

    10. Re:Plans? by Anonymous Coward · · Score: 0

      So have you and your hand set a date?

    11. Re:Plans? by Anonymous Coward · · Score: 0

      NASA-level attention?

      And what exactly would that be? Failure to properly convert units of measurements? The ability to send a myopic telescope into space? Or the piss-poor decision that proceeded the shortest shuttle flight?

  7. I saw it on Tech TV last night by Anonymous Coward · · Score: 2, Informative


    I didn't read the article but I saw this Submarine on TechTV last night. Pretty cool. Will cost approx $15,000. Now some people will have to make a choice between buying an over the surface boat or the sub...

    The guy said they only used 2 engineers and lot of computer aided design to keep the costs low instead of hiring 50 engineers... It didn't seem to move very fast drifting nice and slow... It is supposed to go for as long as 8 hours on single battery charge and can go 1500 feet deep or something like that....

    excuse spelling/gramattical mistakes, if any

    1. Re:I saw it on Tech TV last night by bashibazouk · · Score: 2, Informative

      This story has been playing all week on TV in the Bay area. The $15,000 is how much it costs to take the training classes to Learn how to pilot it.

    2. Re:I saw it on Tech TV last night by Dougthebug · · Score: 1

      "The guy said they only used 2 engineers and lot of computer aided design to keep the costs low instead of hiring 50 engineers..."

      Used a lot of computer aided design eh? Sponsored by AutoDesk (autocad developer) eh? Who'd of guessed?

    3. Re:I saw it on Tech TV last night by Anonymous Coward · · Score: 0

      Grammatical

    4. Re:I saw it on Tech TV last night by Anonymous Coward · · Score: 0

      There is over $1 million in the Aviator. Whoever told you $15,000 made a serious error.

      At U.S. Submarines we build subs from $720,000 to $80 million. A single thruster costs more than $15,000

    5. Re:I saw it on Tech TV last night by netskip · · Score: 1

      While $15,000 is indeed the cost to get trained, don't confuse the design cost with the incremental cost to build sub n+1. That's not necessarily $1M.

      -- Skip

  8. No Ballast? by zer0vector · · Score: 5, Interesting

    If the submarine doesn't use ballast to maintain its depth, it must always be in motion to stay at a depth away from equilibrium. Assuming it is positively bouyant (it floats) the motion of the water over its dive planes would be the only force holding it underwater. This seems a bit limited to me, since you'd never be able to stop and enjoy the view underwater. It's probably because I'd be more interested in the stuff sitting on the bottom of the ocean, rather than the things moving through it, which appears to be the point of the sub.

    --

    ----
    Striving to put right what once went wrong, and hoping each time that his next leap, will be the leap ho
    1. Re:No Ballast? by neksys · · Score: 5, Informative

      The article states that, when the submersible drops beneath "stall" speed (approx 1.2 knots), a conventional ballast system kicks in to maintain dive depth - making it perhaps more versatile than conventional submersibles, as opposed to the limitations that you suggest.

    2. Re:No Ballast? by Anonymous Coward · · Score: 1, Informative

      > The article states that, when the submersible drops beneath "stall" speed (approx 1.2 knots), a conventional ballast system kicks in to maintain dive depth - making it perhaps more versatile than conventional submersibles, as opposed to the limitations that you suggest.

      Note: the referenced article doesn't say this (yes, it's true), it's from a link to a description of the sub at the main site: http://www.deepflight.com/subs/dfa.htm .

    3. Re:No Ballast? by baudtender · · Score: 2, Informative

      This sub uses a conventional ballast system below
      what it calls its "stall speed," but what you
      say isn't necessarily so for other subs that use
      a "no ballast" design. Think of the inverse of
      moveable props like those used on VTOL aircraft.
      You can use propellers pointing up to counter the
      bouyancy.

      One really good reason for not having ballast -
      if you lose all electrical power, you float to
      the surface. Think about it.

      Baudtender

    4. Re:No Ballast? by Gerry+Gleason · · Score: 2, Interesting
      One really good reason for not having ballast - if you lose all electrical power, you float to the surface. Think about it.

      Not only that, but they mention that they can drop ballast in an emergency, so obviously there are ballast systems and components, just that in normal operation, it has a slightly positive boyancy, and need to keep moving to go down.

      With the positive boyancy, you could shut down the motors and concerve power with a sort of inverted gliding. I remember seeing a story (maybe /.) about an underwater drone that could operate for long periods gliding both up and down by shifting the boyancy back and forth between negative and positive.

    5. Re:No Ballast? by barzok · · Score: 1

      Wouldn't all that water moving through the ballast system make a lot of noise? Thinking about research/military applications - you don't want to be making noise which will disturb the area your observing or give away your position.

    6. Re:No Ballast? by Monster+Zero · · Score: 1

      You could always have the propulsion system rotate, so that you could give upward thrust to stay in one spot.

  9. exciting! by jericho4.0 · · Score: 4, Insightful
    "When we get up alongside sperm whales or giant squid it will get really exciting," he said.

    When I'm in a submarine, I don't want anything exciting to happen.

    --
    "A language that doesn't affect the way you think about programming, is not worth knowing" - Alan Perlis
    1. Re:exciting! by Gortbusters.org · · Score: 2, Funny

      Don't forget:
      "We'd like to penetrate the secret world of the squid,"


      Maybe they are looking for something exciting to happen!

      --
      --------
      Free your mind.
    2. Re:exciting! by binarybum · · Score: 1

      aren't you suppossed to break the bottle of champagne on the vessel? The picture shows him preparing to pour it on. If he's planning to get involved with giant squid I hope the thing isn't so fragile that it can't handle a glass bottle smashing into it.

      --
      ôó
    3. Re:exciting! by Anonymous Coward · · Score: 0

      Sperm, Penetrate, Secret...

      Sounds like a description or R.Kelly's sex life.

    4. Re:exciting! by willpost · · Score: 1

      "When we get up alongside sperm whales or giant squid it will get really exciting"

      Sounds like what Captain Nemo of the Nautilus was thinking.

    5. Re:exciting! by trashyspaceman · · Score: 2, Funny

      It has indeed been known to get very exciting in SF bay.

  10. Not a sea plane... by Kentamanos · · Score: 1

    "tried out his new submersible sea plane"

    Not quite...it might feel like a plane in the water, but it's not a submersible sea plane.

    1. Re:Not a sea plane... by Anonymous Coward · · Score: 0

      Some people are so quick to criticise - have YOU built one recently?

    2. Re:Not a sea plane... by Anonymous Coward · · Score: 0

      I was kinda disappointed that it wasn't a sea plane that can also submerge. The majority of the cost for running a deep sub for any length of time is the need for a well equiped support vessle.

      If however you could fly to the destination site, land then submerge even for a short time, than takeoff and return to base, it would allow for scientist to study a single or multiple locations over a large period of time.

      I know plane functions and sub function don't meld well but what about a split craft design, where the sub detaches from the plane section, but remains tethered when submerged (partly to keep track of sub, partly to allow radio to work and possibly power via solar panels on wings, I'm sure you could imagine a few other things). The best part is that the plane or submersible doesn't have to be anything special, they just have to be combined. The plane could be one of the old pod and boon type (eg P38 lighting), where the pod is a detachable submersible (I've seen sub the same size as the pod)

  11. Deep sea for everyone! by bravehamster · · Score: 3, Interesting
    Deep Flight Aviator will revolutionize exploration by making it easier and cheaper for everyone from scientists to filmmakers to plumb the ocean's depths.


    Oh, you mean like the same people who do it now? What about me, average joe six-pack? When can I go dive down that there Marianas Trench? I want to see the Giant Squid in it's native environment and stop the Discovery Channel from doing anymore of those specials where they don't find the damn thing...again!. Is this deep sea diving for the masses, or just an upgrade for those who already do it?

    --
    ---- El diablo esta en mis pantalones! Mire, mire!
    1. Re:Deep sea for everyone! by heff · · Score: 2, Funny

      i can only imagine the horror if everyone had personal submarines.. not because of the dangers, but because of the regulations..

      hell, they banned the segway in SF already.

      --

      --

      |-_-| . o O ( bEef!)

    2. Re:Deep sea for everyone! by Anonymous Coward · · Score: 0

      Dontcha mean Joe Twelve-Pack ?

    3. Re:Deep sea for everyone! by FatHogByTheAss · · Score: 4, Informative
      When can I go dive down that there Marianas Trench?


      Not Marianas, but you can certainly go explore SF Bay. PADI or NAUI should be able to connect you with the right people.


      SCUBA is the best thing you'll ever do with your clothes on.

      --

      --
      You sure got a purty mouth...

    4. Re:Deep sea for everyone! by Anonymous Coward · · Score: 1, Funny

      When can I go dive down that there Marianas Trench

      Any time you'd like. I can loan you an anchor, some rope, and a fish bowl for a helmet....

      Sorry couldn't resist.

    5. Re:Deep sea for everyone! by nounderscores · · Score: 1

      I dont know, unlike a personal helicopter, if this sub is involved in a colission it will simply float back up to the surface.

      Much safer than falling onto my house, or running into my front fence.

    6. Re:Deep sea for everyone! by Anonymous Coward · · Score: 0

      What you have in your stomach area is not a six-pack, it's more like a 200 pound pear shaped balloon filled with thick jello.

    7. Re:Deep sea for everyone! by voidware · · Score: 1

      So true...

      My favorite part is +5 informative.

      I love to dive so much.

      brandon

  12. Is it safe? by Gortbusters.org · · Score: 2, Interesting

    The article makes a nice mention how 75% of the earth is covered in water. Looks like the ocean is one of the last [easy] frontiers, though will the moon be more practicle? This thing looks like the ship in Star War Episode 1.

    Back on topic, I would wonder how deep this version can go. It mentions the depth of a squid of around 1500 feet. The article also reports a second version that will be able to comb the bottom of the ocean. I imagine that will look more like a 747.

    What was the name of that bad star-trek like show that was set in the ocean?

    --
    --------
    Free your mind.
    1. Re:Is it safe? by Anonymous Coward · · Score: 0

      "What was the name of that bad star-trek like show that was set in the ocean?"

      Seaquest

    2. Re:Is it safe? by Anonymous Coward · · Score: 0
      What was the name of that bad star-trek like show that was set in the ocean?

      Could you be thinking of Voyage to the Bottom of the Sea? That had much of the same music and sound effects as ST:TOS, as well as the same overall feel.

    3. Re:Is it safe? by Anonymous Coward · · Score: 0

      > Back on topic, I would wonder how deep this version can go. It mentions the depth of a squid of around 1500 feet. The article also reports a second version that will be able to comb the bottom of the ocean. I imagine that will look more like a 747.

      Have a look: http://www.deepflight.com/subs/df2.htm

    4. Re:Is it safe? by ckaminski · · Score: 1

      I think the parent poster is referring to Seaquest:DSV which, indeed, was a REALLY bad ST-like show... And I *LIKE* anything involving submarines... pah!

      -Chris

  13. Quick question for those in the know... by Kickstart70 · · Score: 2, Interesting
    What is more efficient (speed/energy), a boat or a sub? I suppose that a hydroplaning boat would be, but I am not sure of the fluid physics involved. How much less efficient is a boat than a car in terms of energy expended compared to the speed it travels? How could boats be made more efficient, or could they?

    Kickstart

    1. Re:Quick question for those in the know... by Anonymous Coward · · Score: 0

      Well, often motorboat efficiency is actually measured in gallons / mile!

      But, I much prefer sailboats, which are obviously more efficient than cars or motorboats :D

    2. Re:Quick question for those in the know... by Anonymous Coward · · Score: 0

      Who gives a rip about efficiency when you can have one of these?

    3. Re:Quick question for those in the know... by Aglassis · · Score: 1

      It depends on the design. Most boats are designed with the 'V' shape so that very little of the energy is transferred to the wake of the boat. This makes them very efficient for travelling on the surface.

      When you are talking about a submarine there are 2 designs. There are the diesel boats (i.e. similar to WW II subs) and there are nuclear boats. The diesel boats had the 'V' shape since they had to spend a great deal of their time on the surface and this is a much more efficient way to transit (after all a diesel submarine is pretty much just a surface ship that can occasionally submerge for short periods of time). The nuclear submarines have the 'O' shapes since they have no real need to surface except for return to port and an O shape is more efficient submerged (minimizes surface area and can keep a better balance). When a nuclear submarine is on the surface it takes a major speed hit because a significant amount of energy used for propulsion is transfered to the wake (since it doesn't have the 'V' shape). Therefore a nuclear submarine will travel faster submerged.

      So a diesel submarine should be almost as efficient as a surface ship, but a nuclear submarine will be less efficient (but will travel faster than diesel subs due to raw power).

      --
      Suddenly, the hairy finger of a familiar monkey tapped me on the shoulder. It was time.--G. T.
    4. Re:Quick question for those in the know... by mamba-mamba · · Score: 1
      So a diesel submarine should be almost as efficient as a surface ship, but a nuclear submarine will be less efficient (but will travel faster than diesel subs due to raw power)
      I doubt that this is true. First of all, travelling below the surface is much different than travelling on the surface, planing or not.

      There is a concept in marine architecture called hull speed. Basically, the speed of a non-planing boat is sort of fixed, irrespective of power, at some value which goes up as the square of waterline length. Near this hull speed, as you apply more power to increase in speed, you just make a bigger and bigger wake, but don't really move much faster.

      In a planing hull, as you apply more power near hull speed, the boat sort of pops up off the surface of the water and begins to go much faster. It is no longer floating, but, more skimming on the surface. All fast boats that are small plane. It is just impossible to go fast without planing in a small boat.

      For a submarine, there is no hull-speed issue. Subs can go faster and faster as they apply more power. I believe that nuclear submarine top-speed is classified, but I have heard lots of people say that they can do 60 knots. (1 knot ~= 1.15 mph). I doubt that even an aircraft carrier can do 60 knots. In fact, designing a boat to go 60 knots on the surface of the ocean (not a lake) is a very difficult task.

      When you travel on the surface of the ocean, you have to deal with waves and wind, which become much more formidable as speed increases. A moderate sea is shaped like gentle sand-dunes, although the dunes are constantly shifting and morphing beneath you. A heavy sea (as in a storm) is more like a rock field or something in shape. The wave crests are much closer together, and the motion is much more violent. The waves can easily reach heights of 10, 20 or 30 feet, with crests perhaps 100 feet apart. If you haven't experienced it, it is hard to comprehend just how violent it is. I doubt very much any boat short of a few hundred feet can even go more than 30 or 40 miles an hour in this environment.

      A submerged craft can travel serenely below all this. I imagine there is a bit of turbulence, but nothing like the chaos and danger of the surface.

      Another perspective on all this is the difference between ducks and fish. Small tuna and jacks can easily hit 30 knots. I have seen them jump out of the water going this fast. Spinner dolphins can hit similar speeds. I have heard some people claim that big tuna can hit 40 or 50 knots. I don't know if this is true. Ducks can go about 2 knots.

      The bottom line, I think, is that a low drag body can travel much faster submerged than a floating body of similar size, no matter what the shape. This is especially true when the surface of the sea is rough. Surface craft with very long waterlines MAY be just as efficient, I don't know.

      MM
      --

      --
      By including this sig, the copyright holders of this work or collection unreservedly place it in the public domain.
  14. Seaquest!!! by Monofilament · · Score: 4, Funny

    WOW Seaquest is coming true.. I wonder if it comes with an ultra smart dolphin who has a translater hooked to it so i can have conversations with it.

    Damn I completely forgot about that show before i saw those pictures...

    --


    Who makes you Sig?
    1. Re:Seaquest!!! by FozzTexx · · Score: 1

      Light is dark and one.

    2. Re:Seaquest!!! by CableModemSniper · · Score: 1

      screw seaquest! where's Hagbard Celine at?

      --
      Why not fork?
    3. Re:Seaquest!!! by Master+of+Transhuman · · Score: 1


      Can I go down on ^H^H^H^H^H^H take Stephanie Beacham down in one of these?

      --
      Richard Steven Hack - This sig is TOO GODDAMN SHORT TO DO ANYTHING USEFUL WITH! MORONS!
  15. Voyage to the Bottom of by Chope · · Score: 1

    SF Bay? Here I thought we were talking about a Flying Sub

    Surely I'm not the only one old enough to remember "Voyage to the Bottom of the Sea"? (Que sonar pings and violin intro...

    1. Re:Voyage to the Bottom of by Master+of+Transhuman · · Score: 1


      Yeah, and all those re-used fake monsters they used to have on that show...

      Had some good episodes though - remember James Darren as the android Mr. Omar?

      Skip Homeier as the oceanographer with gills?

      --
      Richard Steven Hack - This sig is TOO GODDAMN SHORT TO DO ANYTHING USEFUL WITH! MORONS!
  16. I'm actor Troy McClure by Anonymous Coward · · Score: 0

    "We'd like to penetrate the secret world of the squid," Gilley said.

    "When we get up alongside sperm whales or giant squid it will get really exciting," he said.

    The lengths some people will go to...

  17. Um... by Anonymous Coward · · Score: 0

    Lewis and Clark's trek through the Northwest Passage.
    All I can say is: What?

  18. More on the design of the sub by bombom · · Score: 1

    I wondered why that sub had autodesk written all over it. A little googling and here is the reason: Inventor

    --
    IOException - Can't Speak
  19. Extreme high pressure... by neksys · · Score: 3, Interesting

    According to thei creator's website, they are planning on creating Deep Flight II, which they hope to pilot to the bottom of the Mariana Trench, some 38,000 feet down. But wouldn't the intense pressure and high viscosity of the water at that depth make it nearly impossible to operate on the flight principle? I don't know the first thing about high pressure underwater maneuvering, so perhaps someone else can tell me why this will (or won't) work?

    1. Re:Extreme high pressure... by RoundTop-VJAS · · Score: 5, Informative
      well... the flight principle would work at those depths. Assuming the parts can stand the pressure (what they are trying to get done). even though the pressure has changed, the resistance of the water will be essencially unchanged. (since the propellers will be biting more in the water, producing more thrust, this will ofset any drag problems). Since it is designed to cut through the water rather than force its way through (conventional sub) it should work.

      The problems at 39k feet are following:

      #1) materials that can stand up to it. I'm sure that a piece of solid metal can, but can the cockpit? #2) If anything goes wrong...ANYTHING. you are dead. #3) Making sure your seals can stand the pressure (any that rupture - see 1 & 2)

      However if the cockpit can sustain the pressures (since it is smaller than a full regular sub it should be able to take more pressure.) then it should be able to hit those depths no problem. Not only that, but at the proposed dive/accent speeds they might have to worry about the bends. at 400ft/min to go 37,000ft would only take 1.5h. All the "modern" subs/deep subs take much longer than that to hit those depths ('cept some military ones...but they don't go as deep [as far as we know])

      This concept has actually been around for a while, however I give massive kudos to these guys for pulling it off not once, but twice. I watched the documentary on discovery about Deep Flight and that was cool. DF Aviator is definately a step in the right direction as it gets rid of the classic sub image.

      As for increasing the speed for more than 6knots.. that is a simple equation.

      Running time = battery power / draw of props (increases as revs go higher)

      So either increase the battery capacity (for the same weight) and speed for the same running time. Or you will sacrifice run time.

      Eg: To make it go ~12knots it would take roughly twice the battery power, reducing its effective time from 8h to 4h (I know there are more things..but that is the major factor).

      Another technique is to increase the size of the props. But that takes more energy to get them spinning (for more thrust though).

      --
      RoundTop

    2. Re:Extreme high pressure... by Forgotten · · Score: 1

      Sea water is nearly incompressible, so the viscosity wouldn't be appreciably higher. If it was, deep-marine fish like ratfish would have a tough time (especially considering how few calories there are down there for the poor things to eat). Sea water viscosity actually depends chiefly on the temperature (colder is more viscous), and to a lesser degree on salinity (more saline is more viscous - this obviously implies that sea water is slightly more viscous than fresh water).

      There are still all kinds of other effects that make diving to that depth very, very difficult. One is the corrosive effect of oxygen in the water at that pressure.

      Anyway, wouldn't a more viscous fluid be better for this thing's method of submergence? It doesn't need to go fast, it just needs to generate downward pressure with the reverse equivalent of an airfoil (or something). Planes get more lift in more viscous air, at least to the point where they can still move forward quickly enough.

    3. Re:Extreme high pressure... by pclminion · · Score: 4, Informative
      According to thei creator's website, they are planning on creating Deep Flight II, which they hope to pilot to the bottom of the Mariana Trench, some 38,000 feet down. But wouldn't the intense pressure and high viscosity of the water at that depth make it nearly impossible to operate on the flight principle?

      The pressure would pose a problem, but, contrary to what you might expect, the viscosity of water actually decreases with pressure, until around 150 MPa of pressure. After that, viscosity starts increasing with pressure.

      That pressure corresponds to about 50,000 feet of seawater. Since (as far as I know) there is no trench this deep on Earth, we probably won't be having problems with viscosity anytime soon.

      Water is definitely one of the most unique substances we have on this planet.

    4. Re:Extreme high pressure... by Sylver+Dragon · · Score: 1

      >But wouldn't the intense pressure and high viscosity of the water at that depth make it nearly impossible to operate on the flight principle?

      Other than the "crush you like a grape" factor of all that water above your head. I don't think there should be much of a problem with this craft manuvering.. From what I recall from my physics classes way back when, water is incompressable. That is, as more pressure is applied to it, its density does not increse significantly. So, I wouldn't expect the viscosity to change much.
      Along the same lines, the control surfaces should continue to function. The big thing I would worry about is accidentally hitting something. "Land" on the bottom of the trench too hard, and you might dent the craft, and weaken the structure. And at that depth, you probably wouldn't get much of a chance to realize what happened.

      --
      Necessity is the mother of invention.
      Laziness is the father.
    5. Re:Extreme high pressure... by aiken_d · · Score: 1

      A good and thoughtful post. I would expand your speed / power point, though, to note that the real issue is efficiency. Yes, if you can get twice the power for the same weight from the batteries, you can double speed. However, you can also find improved efficiency in prop design, water resistance (aquadynamics), etc. Batteries may be one of the best bets, since so much is being spend on improving them but incremental improvements in efficeincy in other areas could also serve to increase performance.

      Cheers
      -b

      --
      If I wanted a sig I would have filled in that stupid box.
    6. Re:Extreme high pressure... by Anonymous Coward · · Score: 1, Informative

      Just got to love those strong Van der Waals forces, that make water unique. (giving it all those neat pressure properties)

    7. Re:Extreme high pressure... by BLAG-blast · · Score: 5, Informative
      I'll try and dispell some myths for you rather than just calling you dumb.

      Since it is designed to cut through the water rather than force its way through (conventional sub) it should work.

      There is no difference between how this submarine moves through the water and how a "conventional sub" would move through the water.

      Making sure your seals can stand the pressure

      Any rubber seals are just for the first few feet. After 30 feet the water pressure will be creating a metal to metal bond (or metal to acrylic or what ever) so the seals will not do anything. If you're refering to the metal to metal bond as a seal, then you kind of right, but any problems would have notice at around 30 feet. As you go deeper the bond will just get stronger.

      Not only that, but at the proposed dive/accent speeds they might have to worry about the bends.

      The bends only apply if you are exposed to outside pressure. This is a 1 ATM sub, you are always at the same pressure as you where on the surface.

      Eg: To make it go ~12knots it would take roughly twice the battery power, reducing its effective time from 8h to 4h (I know there are more things..but that is the major factor). Another technique is to increase the size of the props. But that takes more energy to get them spinning (for more thrust though).

      This isn't really true either, it would probably be more like a quarter of the endurance for twice the speed. But they might be other things limiting the speed such as drag, the sub isn't a very hydrodynamic shape and might have a low terminal velocity.

      --
      M0571y H@rml355.
    8. Re:Extreme high pressure... by mtm · · Score: 1

      Actually, drag increases exponentially with velocity. If I remember correctly, if you double your velocity the drag will increase by a factor of four, barring other non-linear things like laminar flow over the hydrofoils. So, all other things remaining the same, you would have to increase power four times to double the speed.

    9. Re:Extreme high pressure... by BLAG-blast · · Score: 1
      The pressure would pose a problem, but, contrary to what you might expect, the viscosity of water actually decreases with pressure, until around 150 MPa of pressure. After that, viscosity starts increasing with pressure.

      How about a reference? Or should I just take your word for it.

      --
      M0571y H@rml355.
    10. Re:Extreme high pressure... by maddogdelta · · Score: 1

      Eg: To make it go ~12knots it would take roughly twice the battery power, reducing its effective time from 8h to 4h (I know there are more things..but that is the major factor).

      Actually, to make the sub go 2x as fast, you have to use 4x the amount of power. Even though the sub is streamlined, a major component of the drag equation is the frontal surface area, which imposes a lot of drag. So, power required goes up by a factor of the square of the speed increase. IE 2x the speed, 4x the power, 3x the speed, 9x the power.

      Which means that the effective time would be reduced from 8h to 2h.

      Which actually points to what is really needed for a revolution in submersibles, a better battery. (The military managed this with nuclear power, but there are way too many problems for what this guy is trying to do to go with nuclear power). My guess would be some form of fuel cell.

      Lastly, the standard (military) style submarine really does 'fly' like this guy's machine. Think of it, if he didn't use any kind of ballast system, then he would have to supply power in order to generate the 'lift' to keep him from bobbing to the surface. A regular submarine (military) will use ballast to become neutrally bouyant, then use the surface planes to manuver up/down/left/right. (If this seems odd for a sub with such small control surfaces, look at your average dolphin/whale/fish. They do it the same way. 2 billion years of evolution can't be wrong!)

      Richard Hubbard
      there are 10 kinds of people in the world, those who understand binary, and those who dont...
      --
      -- There are 10 kinds of people in the world, those who understand binary and those who don't.
    11. Re:Extreme high pressure... by qbwiz · · Score: 1

      I'm not sure that the cockpit could sustain the pressure. The Trieste, the only manned vessel to go down that far, had a pressure sphere of 6.5 feet in diameter, which isn't that much larger than this's minimum size.

      Also, the pressure compartment was a perfect sphere, to make it work better, and that's not the most conducive form for this type of submersible, but it's also possible to have free-flooding compartments on the outside to make the shape better. The Trieste had a pressure sphere 3 inches thick, so that increases the weight and makes the buoyancy (expecially when you try to make the full sub small) harder to get right.
      --
      Ewige Blumenkraft.
    12. Re:Extreme high pressure... by sowellfan · · Score: 1

      At that depth, the pressure is about 16000 psi. At least you'd never know about a mistake.

    13. Re:Extreme high pressure... by red_gnom · · Score: 1

      At the bottom of the ocean, 38,000 feet down, the pressure is more than 10,000,000kg / m^2
      (ten million)

    14. Re:Extreme high pressure... by passion · · Score: 1

      Water is definitely one of the most unique substances we have on this planet.

      Sure, since it's the only liquid that actually expands when it freezes, it sure does sound rather unique.

      --
      - passion
    15. Re:Extreme high pressure... by titzandkunt · · Score: 0


      "Water is definitely one of the most unique substances we have on this planet"

      How about "strangest", or "most anaomolous" instead?

      Yours pedantically,

      T&K.

      --
      Political language ... is designed to make lies sound truthful and murder respectable...
  20. More cool Small Submarines by TheLurker · · Score: 5, Interesting

    For more cool homebuilt submarines, check out the Personal Submersables web page.

  21. A new fevered mantra.... by TygerFish · · Score: 1

    Seeing it gives me a new fevered mantra:

    Gotta make money....
    Gotta make money....

    --
    To mail me, remove the 'mailno' from my email addy.
    "Yeah. It smells, too..."
  22. Strange picture... by NanoGator · · Score: 3, Funny

    I bet somebody could cook up a hilarious caption for this picture.

    "The bionic dorsal fins aren't what scares me, it's the frickin laser beam attched to it's head!"

    --
    "Derp de derp."
    1. Re:Strange picture... by Anonvmous+Coward · · Score: 3, Funny

      "http://www.sfgate.com/chronicle/pictures/2003/01/ 24/ba_sub04.jpg"

      Man I'm tempted to make a rude Kenny Baker joke.

    2. Re:Strange picture... by NanoGator · · Score: 2, Funny

      "Man I'm tempted to make a rude Kenny Baker joke."

      I'll give that a +1, Obscure Star Wars Reference.

      --
      "Derp de derp."
    3. Re:Strange picture... by wideBlueSkies · · Score: 1

      Hurry up. Let's get below. I'm so hot right now.

      --
      Huh?
    4. Re:Strange picture... by Ric0chet · · Score: 1

      Well, I guess we've answered the whole "water on Mars" question, huh Fred?

      --


      How you see the world is how the world sees you.
    5. Re:Strange picture... by Anonymous Coward · · Score: 0

      Lenny: Oh Harold, we forgot to pack some fudge.

      Harold: I think we can make do with yours. Drop'em and spread, d00d.

      Lenny: OH! OH! Let's flood the balast and make do with our slippery hagfish! Mmmmmm...OH! YES! YES! OH YES!

    6. Re:Strange picture... by davidhan · · Score: 1

      "Black Manta and his longtime companion, Dolphin Boy, enjoy a romantic cruise around the Bay..."

  23. Damn! by Reality+Master+101 · · Score: 2, Funny

    tried out his new submersible sea plane yesterday in SF Bay.

    When I read this, I thought it was an airplane that could turn itself into a submarine! Now that would be cool... you could fly to an interesting spot, and then dive into the water.

    Given that this thing is intended to glide like airplane, except in water, I wonder what it would take to make it able to fly in air? Probably a lot of engine power that it doesn't have, and a lot less weight. :(

    --
    Sometimes it's best to just let stupid people be stupid.
    1. Re:Damn! by joshuac · · Score: 1

      ---snip
      Given that this thing is intended to glide like airplane, except in water, I wonder what it would take to make it able to fly in air? Probably a lot of engine power that it doesn't have, and a lot less weight. :(

      ---snip

      ...and for the hydrofoils that are designed to create downward force when moving through the water to start making upward force when being used as airfoils, amongst other problems...but a flying submersible would rock. The police vtol jet plane/wheeled land vehicle (I think)/submersible shown briefly in the movie "AI" was pretty neat...

      more interesting than other parts of the movie, come to think of it.

    2. Re:Damn! by Anonymous Coward · · Score: 0, Offtopic

      I believe JFK jr. was experimenting along these lines...

    3. Re:Damn! by Anonymous Coward · · Score: 0

      Just like in Final Fantasy 5 and 7, yippee

  24. Reminds me of this.... by Anonymous Coward · · Score: 1, Interesting

    One of the createst commics of all time: Tintin!

    1. Re:Reminds me of this.... by ashitaka · · Score: 1

      Dammit! Beat me to it.

      I was going to link: here.

      --
      If you don't want to repeat the past, stop living in it.
  25. Feh. by cporter · · Score: 3, Interesting
    I still want one of these.

    "The ultimate personal transportation device, 65 meters (213 ft.) in length with 470 square meters (5000 sq. ft.) of interior space on 4 levels. As proposed, the submarine would constitute the single largest private undersea vehicle ever built."

    1. Re:Feh. by Blimey85 · · Score: 1
      That's what I'm asking Santa for next christmas!!!

      5000 sq ft... that's like 4 times the size of my apartment, and the views here suck. Now if only it had a broadband connection of some sort so I could still look at porn, then I would buy it... but until then... tis only a dream.

      --
      How is it that one careless match can start a forest fire, but it takes a whole box to start a campfire?
    2. Re:Feh. by thrillseeker · · Score: 1
      I still want one of these.

      I happen to know the owner of US Subs. One of the neater projects he's involved in is the development of an underwater resort hotel. There will be multiple transparent acrylic suites that are designed in a way to provide privacy from each other biut allow unobstructed viewing of the coral reefs wherever it is placed. It's a very neat project, not requiring a tremendous amount of investment money, and he has some knowledgeable advisors involved. You can find a small amount of public info at Underwater Hotel.

    3. Re:Feh. by Anonymous Coward · · Score: 0

      Why buy one of these? There are a bunch of them in Disneyworld in a pond!

  26. Actually... by __aadhrk6380 · · Score: 0

    This would work out great for me, as anything I tried to fly would end up in the damned water anyway.

  27. i just hope... by nuckin+futs · · Score: 1

    that they sell those things to the right people, or at least screen the buyers.
    I don't want any terrorist group getting a hold of one of those.

  28. A Cheaper Alternative by Bowie+J.+Poag · · Score: 3, Funny



    If anyone from San Francisco (or California, for that matter) is looking to see the bottom of the SF Bay, I can help you. I have plenty of rope and quick-dry concrete, and I'll be happy to help you experience the natural wonders only the sea can offer.

    Cheers,

    --
    Bowie J. Poag

    1. Re:A Cheaper Alternative by Anonymous Coward · · Score: 0

      If your not or have not previous been associated with the Italian Mafia, they'll probably be able to sue you under the DMCA...or possibly for trademark infringment
      --i am italian btw, and my relatives in the past have had connections....

  29. Possible problem by ELCarlsson · · Score: 4, Funny

    "They wear khaki coveralls with lots of zippered pockets"

    Okay, so you're 150 ft under the water when you're homemade sub springs a leak. And what are you wearing to save you? Khaki coveralls. Sure hope they have something helpful in one of those zippered pockets.

    1. Re:Possible problem by Anonymous Coward · · Score: 1, Funny

      i would place duct tape in one of them...

  30. So basically.. by Some+Var · · Score: 1

    If it looks like a plane, and moves like a plane.. it's probaly a sub

  31. build your own sub by paughsw · · Score: 5, Interesting

    This team at Virginia Tech, (I used to be on it) are the three time world champs for a human powered submarine. Check them out, lots of cool videos, and documentation. www.hps.vt.edu

    1. Re:build your own sub by Guppy06 · · Score: 1

      "the three time world champs for a human powered submarine."

      Ah, but did you manage to sink the Housatonic?

    2. Re:build your own sub by rngadam · · Score: 1

      yeah, but if you want to read about the WORLD FASTEST HUMAN POWERED SUBMARINE, you'll have to check out our school sub, Omer ;-)

  32. has been done before by floRizla · · Score: 3, Funny

    This thing is not as original as it seems.
    If you know the comic books of Tintin, there is one album where Tintin and his friend (ship cpt. Haddock I believe) explore the sea in a shark-shaped submarine. It has very much the same shape as this thing, including the windows that have the shape of a half sphere.

    So, one of the co-inventors is Belgian comic designer Hergé. And Possibly Leonardo da Vinci too, for that matter.

    1. Re:has been done before by LogicET · · Score: 1

      This would actually mean something if the author of the Tintin books who drew that shark-submarine also engineered one to work outside of the imagination.

    2. Re:has been done before by Anonymous Coward · · Score: 0

      Then I guess Da Vinci gets no credit for anything but painting and sculpture.

      Your comment means fuck all no matter what the circumstances. Congratulations on a useless post, you stupid prick.

  33. Buoyancy and "flight" by harangutan · · Score: 2, Interesting

    A couple of issues that don't seem to be addressed in the article:

    They must have buoyancy control nearly equal to that of submarines because the amount of energy required using "flight surfaces" to maintain depth would increase hugely as a function of depth. Unlike in true flight, where it doesn't require more energy to maintain an altitude of 2000 feet than 1000, it takes incomparably more energy to maintain a depth of 2000 feet compared to 1000 if you're not using buoyancy control. I'd venture to suggest it's impossible.

    Also, in flight a wing uses reduced air pressure above the curved top of the wing surface (Bernoulli's Principle) for most of its lift. Does anyone know if this effect applies in water? Intuitively it seems like it would not.

    1. Re:Buoyancy and "flight" by paughsw · · Score: 2, Insightful

      Bernoulli's principle still applies, in fact, water behaves alot like air, except that it's more dense. you have to have the right airfoil shape thought

    2. Re:Buoyancy and "flight" by russellh · · Score: 1
      There is a number of interesting activities going on in this area, such as the Slocum Glider. I read about that in a Navy SBIR topic last year sometime but can't find it right now.

      here is an interesting related one from the Navy's Phase I Selections from the 02.1 Solicitation:

      Physical Sciences Inc. (PSI) proposes to develop marine propulsion concepts that employ biologically inspired aerodynamic mechanisms to enhance propulsor thrust and decrease the propeller rotation rate necessary to maintain a specified forward speed. Flying animals take advantage of three unsteady aerodynamic mechanisms to generate lift and propulsive power greater than that predicted from quasi-steady conventional airfoil theory. The three mechanisms are delayed stall, rotational circulation (including the clap and fling mechanism), and wake capture. In Phase I we will formulate three propulsion concepts, each incorporating one or more biomimetic unsteady aerodynamic mechanisms. Using phenomenological models and experimental data from literature, the concepts will be evaluated for lift production, efficiency, simplicity, and ease of practical implementation. Key physical and non-dimensional flow parameters will be identified for each concept. The most promising propulsion concept will be experimentally investigated in the PSI low speed wind tunnel to understand unsteady flow mechanisms. Phase I will conclude with a recommendation of which of the proposed designs, or modified designs, should be further studied in Phase II. In Phase II various models of promising concepts will be fabricated and the propulsive forces produced by these models will be measured in a wind or water tunnel. The proposed propulsion concept will allow military marine vehicles and devices including UUVs, ROVs, torpedoes, and Anti-Torpedo Torpedoes to travel at a specific speed with a lower propeller rotation rate, hence radiating less detectable noise. This will increase the stealth of these devices. The proposed mechanisms may also increase the fuel economy of these vehicles as well as surface ships. Potential applications of this device include commercial UUVs and ROVs as well as recreational boating.
      --
      must... stay... awake...
    3. Re:Buoyancy and "flight" by Mark+(ph'x) · · Score: 1

      well... sharks sink if they dont keep moving, so i would suggest it is possible to make lift somehow ;)

      im guessing you would be using reduced water pressure on the bottom of the wing though, to suck it down (as its bouyant*)

      * hooray for dyslexic spelling skills :/

      --
      those who control the past, control the future. those who control the present, control the past.
    4. Re:Buoyancy and "flight" by mark_space2001 · · Score: 1
      > Also, in flight a wing uses reduced air pressure above the curved top of the wing surface (Bernoulli's Principle) for most of its lift. Does anyone know if this effect applies in water? Intuitively it seems like it would not.

      Yes, water flowing over a foil (technical name for a wing) produces lift. Keels on modern sail boats are foils, and use lift to help the sail boat sail *up* wind. That lift is one of the reasons why a modern sloop can point so high to the wind. Rudders on sailboat produce lift also, which is what turns the boat. (Flat surfaces can produce lift just like a foil can.)

  34. NOthing new under the sun by crmartin · · Score: 1

    Martin Caiden wrote a book about just such an "underwater plane" probably 40 years ago....

  35. Re:Extreme high pressure...doesn't change physics by BurritoJ · · Score: 1

    Water is for all practical purposes uncompressible. It's viscosity at depth will still be similar to what it is at sea level. By the same token, high pressure won't change the aero/hydrodynamics of the craft. Lift/dive force is still going to be the difference between the pressures on the top and bottom of the 'wing'. They will need to design the craft to withstand those pressures and that will change how it looks and handles, but the rules of the game won't change.

    Joe

  36. Idea stolen from Tintin! by DennisZeMenace · · Score: 2, Interesting

    I hope this guy is paying royalties to Tintin's friend : Professor Tournesol. He was definitely first

    DZM

    1. Re:Idea stolen from Tintin! by stephanruby · · Score: 1
      I hope this guy is paying royalties to Tintin's friend : Professor Tournesol. He was definitely first [casterman.com]

      I think Leonardo Da Vinci predates Professor Tournesol. (Granted, Leonardo's submarine was only a "semi-submersible")

      http://www.loadstar.prometeus.net/leonardo/ships.h tml
      "The 'submarine' was simply a shell with room enough for one person to sit inside. It was topped with a conning tower which had a lid and pre-dated the true submarine by over one hundred years. Leonardo was to describe it as a "ship to sink another ship."

      Leonardo considered that the best way to defend against underwater attack by ships similar in design to his 'submarine' was to have double-hulled boats. This would not only solve the problem of ramming, but also that of divers interfering with the vessel. By this time he had already devised a method by which divers could separate the planks of ships.

      He considered how lost ships could be recovered, and designed air-filled tanks which divers could attach to the hulls of a sunken ships in an attempt to re-float them. And once your ship is once more on the surface you need to remove the excess water. Leonardo then designed a machine which would extract the water and then dry the holds of ships.

      His designs included a one-man battleship, and in considering ships for wartime use Leonardo realised the importance of making guns easier to load and fire. This same drawing displays two remote-control guns with rapid-firing mechanisms. "

  37. Some physics guesses.. by Anonymous Coward · · Score: 0

    I'm guessing that the exact same aerodynamic principals apply to absolutely any type of fluid. As the pressure and relative boyancy changes, the relative speeds at which flight is possible also change.

    Liquid hydrogen, air, water, super-dense water, molten lead, just about anything could be used for flight assuming it's not magnetic or other unusual properties.

    This underwater glider is the exact opposite of the Mars glider proposals - mars has a very thin atmosphere, but it's theoretically possible to build a plane that would work for efficient exploration on that planet. Of course, the wings would have to be huge and takeoff speed would have to be about 400 miles an hour (see various Science-Fiction books [eg: Venus Prime series] and the X-Plane flight simulator).

    It's even possible to go "supersonic" underwater, ie: those rumoured super-cavitating torpedoes that the Russians were developing. Above a certain speed, the wake caused by the nosecone can create a partial vacuum - if you design your rocket-propelled torpedo to "fly" in that vacuum you can go very, very fast relatively efficiently.

    Now _that_ would be slick underwater transport.

  38. What the hell is wrong with Slashdot? by Lethyos · · Score: 1, Offtopic

    Lately, Slashdot's moderation system has been horribly broken (mismatch of scores reported to me versus what's in the actual thread) and doing any kind of a submit takes several retries and usually takes minutes to complete.

    What's going on here! This sucks!

    --
    Why bother.
    1. Re:What the hell is wrong with Slashdot? by helix400 · · Score: 1
      Ya, we're Offtopic, but what could be more fun that Slashdot bashing?

      The latest moderating annoyance to me has been Slashdot math. If your article is modded +5 Insightful, +5 Interesting, +5 Informative, +5 Funny, and +5 Underrated, you stand at a total score of 5. Nothing wrong about that...but if some jerk comes along, and gives you -1 Troll, then you're score becomes +4.

      5+5+5+5+5-1 = 4
      Heh...only on slashdot.

    2. Re:What the hell is wrong with Slashdot? by alexburke · · Score: 1

      The latest moderating annoyance to me has been Slashdot math. If your article is modded +5 Insightful, +5 Interesting, +5 Informative, +5 Funny, and +5 Underrated, you stand at a total score of 5. Nothing wrong about that...but if some jerk comes along, and gives you -1 Troll, then you're score becomes +4.

      You're new here, aren't you?

      by helix400 (558178)

      Thought so. Allow me to clear up some confusion:

      You don't ever get +5 in one shot, it's the addition of moderations applied to your comment.

      If you post a comment with an original score of 1 (assuming you don't have/use your +1 bonus), then a moderator comes along and thinks your post is funny and flags it as Funny, your score will have a "+1, Funny" moderation applied to it, leaving your post at a score of "2, Funny".

      Then someone else comes along and moderates your post as Informative. That gives it another +1, and leaves your post at "3, Informative". (The wording Funny, Informative, etc only reflects the LAST moderation done to the post, which is how you can have "Score:4, Troll", which was a Score 5 that was then modded down as being a troll.

      The lesson is now over, class. No running in the hallways.

    3. Re:What the hell is wrong with Slashdot? by Idarubicin · · Score: 2, Insightful
      ...Slashdot's moderation system has been horribly broken (mismatch of scores reported to me versus what's in the actual thread)...

      What's happening is that when a comment moderation is reported to you (and also immediately after you submit a comment) the moderation total will reflect the +1 score that you get for being logged in, but the +1 (for a total of +2) karma bonus doesn't show up.

      The moderation tallies are actually correct when you look at the lists of comments--you get the bonuses to which you're entitled. If you check your user profile, the correct values are reported there as well. So the system isn't really 'horribly broken', it's just a bit flaky. Someone will fix it eventually. In the meantime, you're not just here for the karma, are you? You just want to contribute in a positive way to the discussion, so don't sweat the totals.

      ...and doing any kind of a submit takes several retries and usually takes minutes to complete.

      I've noticed this as well. Perhaps the ol' Slashcode isn't up to snuff anymore? Or maybe the number of users is starting to put a strain on the system. I don't have to make multiple retries; I find that waiting a minute for the submission to go through works. If it's not worth waiting a minute to say, it's not worth saying, right?

      Aside: I know this is offtopic. I am posting without karma bonus so I'm a smaller target for moderators. ;)

      --
      ~Idarubicin
    4. Re:What the hell is wrong with Slashdot? by helix400 · · Score: 1
      You'd think with such a low slashdot ID number, that you'd know what you're talking about.

      You're new here, aren't you?...Thought so

      I've been here over a year, (in case you haven't been keeping track of slashdot #'s)...I have excellent karma, receive 5 mod points every week, etc.

      The wording Funny, Informative, etc only reflects the LAST moderation done to the post, which is how you can have "Score:4, Troll"

      No, the score reflects the last moderation, but the wording reflects the most popular moderation you've received so far. So in your example, the article would become Score:4 Informative.

      I thought a slashdot user as old and wise as you would have known these things, but then again, you're still making first posts.

    5. Re:What the hell is wrong with Slashdot? by raind · · Score: 1

      Dude don't worry about it's only/.!

      --
      Get up!
    6. Re:What the hell is wrong with Slashdot? by SoupIsGoodFood_42 · · Score: 1

      Kuro5hin does it better: You choose from 1-5, and the score is an average of all the votes.

    7. Re:What the hell is wrong with Slashdot? by Galvatron · · Score: 1

      The parent was right, that's how it used to work. However, it appears that Taco is now experimenting with changing the description to the most popular mod. Note how now we're seeing percentages of moderation, instead of actual scores?

      --
      "The question of whether a computer can think is no more interesting than that of whether a submarine can swim" -EWD
    8. Re:What the hell is wrong with Slashdot? by Galvatron · · Score: 1

      No, that's not better, because to get the average closer to where you think it ought to be, you should always either vote 1 or 5. So averaging the scores is absurd, the +/- moderation at slashdot is much more effective.

      --
      "The question of whether a computer can think is no more interesting than that of whether a submarine can swim" -EWD
    9. Re:What the hell is wrong with Slashdot? by alexburke · · Score: 1

      I thought a slashdot user as old and wise as you would have known these things, but then again, you're still making first posts.

      Hey, sometimes I still feel the need to post an old-school Frist Psot (or Frosty Pist) or troll. Not often, mind you, but when you've got THIS much karma to burn, you might as well stoke the fires of moderation, huh?

    10. Re:What the hell is wrong with Slashdot? by SoupIsGoodFood_42 · · Score: 1
      The the score Kuro5hin shows is representive of all the people who voted, and not the last person.

      The slashdot system means that if 2 people think it's worth 5, someone else can make it a 4, even though more people think it's worth higher than a 4.

      Slashdot's system relies on the last person making an honest choice or "being right" so to speak. We all know that not all moderators make a good judgment.

      It does work of course. But I think Kuro5hin works a bit better, even thought it also has flaws (people voting to the extreme to change the average, and not just voting the score they think it deserves.

      I think the best way would be some way where you vote +1, -1 (like slashdot), but it uses an average (like kuro5hin).

  39. all right! by zogger · · Score: 1

    --way to go GEEKS! That's one nifty little bicycle ya got there!

  40. Nah... by hondo77 · · Score: 2, Funny

    Now this is a "submersible sea plane"!

    --
    I live ze unknown. I love ze unknown. I am ze unknown.
  41. Blue Angels? You got to be kidding... by xmnemonic · · Score: 1

    F/A-18's look way nicer than that.

  42. that stinging feeling you'll get .... by Anonymous Coward · · Score: 0, Flamebait

    at the DesktopLinux Summit will be me, slapping you in the head, hopefully jarring the Asshole Molecules in your brain.

    p.s. the process described above won't put you in any better situation to get a goddamn job. but man, it sure will be funny.

    1. Re:that stinging feeling you'll get .... by Bowie+J.+Poag · · Score: 1



      That last troll was posted by:


      McDaniel, Scott mcdev@mcdev.com, pipebomb@pipebomb.net
      McDaniel Development
      2139 Old Highway 5 South, and..
      637 Riverside Dr.
      Ellijay, Georgia 30540
      United States
      (706) 698-5112


      Feel free to call this troll. He's lives with his mom, and that's her voice in the answering machine message. Every time Mr. McDaniel decides to troll, another copy of his personal info will be posted immediately afterward.

      --
      Bowie J. Poag

    2. Re:that stinging feeling you'll get .... by Anonymous Coward · · Score: 0

      how about every time you decide to troll, we slashdotters call your house and tell you to get a fucking job.

    3. Re:that stinging feeling you'll get .... by Bowie+J.+Poag · · Score: 1

      That last troll was posted by:


      McDaniel, Scott mcdev@mcdev.com, pipebomb@pipebomb.net
      McDaniel Development
      2139 Old Highway 5 South, and..
      637 Riverside Dr.
      Ellijay, Georgia 30540
      United States
      (706) 698-5112

      Feel free to call this troll. He's lives with his mom, and that's her voice in the answering machine message. Every time Mr. McDaniel decides to troll, another copy of his personal info will be posted immediately afterward.

      --
      Bowie J. Poag

    4. Re:that stinging feeling you'll get .... by Anonymous Coward · · Score: 0

      by the way...I'm not that guy. I think posting his mom's phone number says a lot more about you than it does about him. One must wonder why you're such a mean poster.

    5. Re:that stinging feeling you'll get .... by Bowie+J.+Poag · · Score: 1



      That last troll was posted by:

      McDaniel, Scott mcdev@mcdev.com, pipebomb@pipebomb.net
      McDaniel Development
      2139 Old Highway 5 South, and..
      637 Riverside Dr.
      Ellijay, Georgia 30540
      United States
      (706) 698-5112

      Feel free to call this troll. He's lives with his mom, and that's her voice in the answering machine message. Every time Mr. McDaniel decides to troll, another copy of his personal info will be posted immediately afterward.

      --
      Bowie J. Poag

  43. neat by Anonymous Coward · · Score: 1, Funny

    reminds me of that tintin book...

  44. Hmm by spaceorb · · Score: 0, Troll

    "Graham Hawkes?'
    Graham: Yes?
    "This is Osama Bin Laden"
    Graham: Oh, hello Osama! My fellow countrymen sure hate you, but we don't judge anyone out here in California. You were just trying to express your opinions and -
    Osama: Whatever Graham, how much for a few of those small submarines? I feel the need to 'express my opinion' again.

    1. Re:Hmm by Anonymous Coward · · Score: 0

      -1 flamebate

  45. Thunderbirds Are GO! by Anonymous Coward · · Score: 0

    Looks to me more like Thunderbird 2!

  46. How long til these are outlawed? by Anonymous Coward · · Score: 5, Insightful

    A cheap, small, personal submarine, capable of carring two people--or one person and 200lbs of drugs from Mexico or Canada into the U.S.A. (or 200lbs of explosive, or ...)

    Watch the U.S. Coast Guard build lots of sonar installations. Watch the ecologists sue the Coast Guard for what all that sonar does to the sea life.

    Watch Congress outlaw personal submarines.

    1. Re:How long til these are outlawed? by nounderscores · · Score: 1

      Nah, they'll just outfit them with those russian underwater guns and we'll see mercinaries being hired to protect the country from incursion... wasn't that the plot of anachronox?

    2. Re:How long til these are outlawed? by Anonymous Coward · · Score: 0

      nup, that was aquanox and it is nothing like the plot.

    3. Re:How long til these are outlawed? by Anonymous Coward · · Score: 0

      Nah, I find it unlikely that drug dealers would be satisfied with something as small and piddly as a couple hundred pounds of transportation ability when they have hundreds of Mexican drug mules.

      For them to be interested the submarine would have to be able to carry a massive amount of drugs.

      Say, maybe 200 tons (yes, tons) of cocaine?

      http://www.cnn.com/2000/WORLD/americas/09/07/col om bia.drugsub.ap/

      I suck at html, so cut and paste. I promise, it's worth it.

    4. Re:How long til these are outlawed? by rthille · · Score: 1
      Watch Congress outlaw personal submarines.
      While ignoring the fact that it's really easy to sail a 40' sailboat right up to the base of market street, regardless of where you've been, and whether or not you're carrying a nuke...
      --
      Awesome furniture, accessories and cabinetry in Santa Rosa, CA: http://humanity-home.com/
  47. DAMN... by Lord_Slepnir · · Score: 1

    is this something they're taking down, or returning to its spot under a bridge.

  48. Saw the sub met the guy by Usquebaugh · · Score: 2, Interesting

    About a month ago I was in a SF Bay area marina, checking my 5o5 was still on the trailer after a storm. When I saw two guys wheeling out two J shaped funnels. Turned out these were the crew compartment and they were off to be pressure tested in Texas, Houston I think. I knew what deep flight was but these were meant to be more civilised.

    Personally I still prefer the original Deep Flight.

    On a side note the bernoulli effect isn't much in use. It's more the angle of attack of the wings. Think diving planes not wings.

  49. About "The Bends"... by thebigmacd · · Score: 2, Insightful

    *IANAEngineer*

    As I understand it, The Bends occur when the body of a diver is subject to the pressures exterted by water at depths. Breathing air is regulated by SCUBA gear such that the pressure increases to offset water pressure on the lungs. This increases the pressure of nitrogen gas in the blood, which expands when the pressure is released.

    I have a feeling The Bends would not be a problem in a submersible, depending on one condition - internal air pressure is not raised to reduce pressure stress on the hull. At any great depth, water pressure is so great as to make the benefit of any reasonable air pressure increase negligable.

    I think that the hull would simply be made strong enough to withstand the water pressure with internal air pressure remaining at sea level air pressure or thereabouts. In this case, the human body would not be subjected to pressure increases/decreases as the sub dives and ascends.
    IIRC, military submarines do not change internal pressure when changing depth. Therefore the Bends are not the limiting factor of dive rate - what limits the rate for military subs is that the steel pressure hull cannot withstand rapid pressure changes without contorting dangerously.

    If someone made a deep-sea diving sub with a pressure hull made of a material very resistant to rapid change in pressure, there would be no theoretical limit to dive rate, even with a human inside. *As long as the hull is strong enough to allow constant internal pressure*

    I may be very very wrong, but this is my observation.

    1. Re:About "The Bends"... by zenyu · · Score: 1

      If someone made a deep-sea diving sub with a pressure hull made of a material very resistant to rapid change in pressure, there would be no theoretical limit to dive rate, even with a human inside.

      Almost... if you go accelerate too fast the G's would kill you. Of course I have no idea where you'd get the power to do that, even with a nuclear reactor. But first we have to find a stronger alloy anyway. I think there is hope we'll do that before we create the high efficiency fusion reactors to rocket down to the trenches. ;)

      I may be very very wrong, but this is my observation.

      IAAE and you're not very very wrong.

    2. Re:About "The Bends"... by KewlPC · · Score: 2, Informative

      I always thought that the bends occurred when ascending (coming back up to the surface), not descending (diving).

      Being in a submersible that increased the air pressure to help ease the stress on the pressure hull therefore wouldn't cause a problem, so long as the air pressure was slowly brought back to 1 atmosphere on your way back up to the surface.

      If memory serves, nearly all submersibles capable of deep submergence increase the air pressure at least a little to help counter the pressure of the water. In fact, if the air pressure was close enough to the water pressure, you could go outside and swim around (until you got hypothermia from the extremely cold water, anyway).

      The only real problems with increasing the air pressure are oxygen concentration (as you increase the air pressure, you increase the amount of oxygen per cubic inch, thereby increasing the amount that you breathe in; too much oxygen will kill you) and making sure that the pressure is released slowly enough to prevent the bends (possibly resulting in the crew having to sit inside the sub after it has been brought back onboard while they wait for the pressure to drop to 1 atmosphere, depending on the sub's ascent rate).

      IIRC, the bends only occur when you ascend too quickly (or the pressure in a pressurized sub drops too fast). The cure is to sit inside a pressure chamber, with the pressure racked up to equal what you would've felt at whatever depth you were at when you began your (too rapid) ascent, and then have the pressure slowly brought back to 1 atmosphere.

    3. Re:About "The Bends"... by balloonhead · · Score: 1
      The bends are the result of pressurised gas in the bloodstream at depth becoming de-pressurised when sufacing and hence less soluble - gas bubbles then form in the blood vessels and occlude blood flow, leading to the clinical manifstations.

      This is more a problem with diving as the body is directly pressurised by the surrounding water. In a submersible, the pressure does not necessarily need to increase - the hull takes the pressure. So the bends don't need to occur as you can maintain atmospheric pressure in the actual internal environment of the sub.

      --
      This idea was invented by Shampoo.
    4. Re:About "The Bends"... by KewlPC · · Score: 1

      In fact, if the air pressure was close enough to the water pressure, you could go outside and swim around (until you got hypothermia from the extremely cold water, anyway).

      I should point out that you'd still need an airlock to go outside the sub. However, because the air in your lungs has enough pressure to counteract the pressure of the water, and because the rest of your body has adjusted to it, you don't get crushed.

      So at least Sphere (the movie, didn't read the book) got something right ;)

    5. Re:About "The Bends"... by Anonymous Coward · · Score: 0

      No manned submersibles increase the internal air pressure at any time during a dive. All are one-atmosphere vehciles that completely isolate the occupants from the physiological constraints suffered by divers. Getting the bends in a conventional manned submersible, tourist submarine or military submarine cannot happen during normal operations.

  50. Voyage to the Bottom of the Sea by skatedog · · Score: 1

    Only $15,000 to be trained as a sub-pilot?! And cost so far $1 million?! Looks like I'll have to stay content with a snorkel, mask and fins....

    --
    "skate the web"
  51. Claustrophobia by slifox · · Score: 1

    Looks neat, but theres so little room! Even the most non-claustrophobic people would get worried after being far under water for long periods of time without being able to move around at all.

    If they made it into more of a compartment (like subs today use), I think it would become much more practical.

  52. Wow... by DCowern · · Score: 1

    This is one of the most obvious-yet-so-long-in-the-conception inventions I've seen. It really is brilliant. Air is a fluid (from an engineering standpoint) just like water. Why not fly through the water just like you do through the air. I especially liked the dirigible/plane analogy in the article. Brilliant work!

  53. Seven Miles Down by Anonymous Coward · · Score: 0

    Jacques Piccard and Robert S. Dietz wrote the book on deep water expeditions: Seven Miles Down, The Story of the Bathyscaph Trieste. They predicted the development of small, personal, deep-water, diving-plane instruments. However they cautioned against ultra-deep use, such as at Marianas. They tested in San Diego Bay, among other places.

    1. Re:Seven Miles Down by Anonymous Coward · · Score: 0

      BTW, they're the only humans ever to visit the Marianas Trench- and return alive.

  54. It is a common misconception that penguins. . . by kfg · · Score: 4, Interesting

    can't fly. You even see them refered to as "flightless" birds in the text books.

    The fact is that they don't fly * in air.*

    Watch a penguin "in flight" and this idea is just as obvious as flying machines in air are from watching a hawk soar. I'm only surprised that it's taken this long for someone to actually go ahead and build one.

    Nor is the concept unique to the water. There was an experimental plane some decades ago that was a zeppelin shaped like a flying wing. It was heavier than air, but only by a matter of pounds and flew by the lift produced by its wing shape, but was nonetheless dirigable.

    I can find no reference to this plane on the web (surprise, not everything is recorded on the web, go figure) but New Yorker magazine once did a piece on it.

    The basic principles of buoyancy and lift apply to any fluid medium. All the rest is just commentary and you can find "planes," "zeppelins," "blimps," and even "helicopters" in the natural underwater world as inspiration. Just as you can in air.

    KFG

    1. Re:It is a common misconception that penguins. . . by Anonymous Coward · · Score: 0

      Quite so. See above post, and note that the bathyscaph Trieste and Trieste II were the underwater equivalents of hot-air balloons. They use aviation gasoline for expandable media, and ballast. Piccard deserved a Nobel for the work.

    2. Re:It is a common misconception that penguins. . . by Anonymous Coward · · Score: 0

      So does this meen that the submarine has to run Linux? :-)

    3. Re:It is a common misconception that penguins. . . by Anonymous Coward · · Score: 0

      there is a book by John McPhee called 'the deltoid pumpkin seed'. he is a writer for the new yorker mag. great book, better writer.

      it came out years ago, maybe 20.

  55. Sign me up! by kaoshin · · Score: 1

    I don't know much about subs, but I've played a lot of that game pirates. I wonder if I built one, painted a jolly roger on it and strapped on some homebuilt rockets if I could become a privateer for the U.S. and earn some bounty. Any o you landlubbers wanna follow me to davey joneses locker? arrrrrr

  56. Tintin ! by bot · · Score: 1

    Does anyone remember a Tintin comic with the exact same type of sub? I think it was Red Rackam's Treasure.

    1. Re:Tintin ! by Denver_80203 · · Score: 1

      The was my FIRST thought seeing it as well! Caculus's personal sub. Diving to the Unicorn!

  57. NorthWest Passage? What The Hell? by KanSer · · Score: 1

    "The maiden voyage of Deep Flight Aviator in San Francisco Bay, they said, ranks with the Wright brothers' flight at Kitty Hawk and Lewis and Clark's trek through the Northwest Passage."

    Yeah, and I come from Soviet Russia. The Northwest passage doesn't exist, English.

    Since when did news paper policy include 'making shit up'?

    --
    • MOD PARENT UP by Anonymous Coward Wednesday April 20, @4:20
    1. Re:NorthWest Passage? What The Hell? by BlacKat · · Score: 1

      Hmm, try a google search for "northwest passage" then...

      Looks like a *lot* of misinformed people out there who believe it exists by the looks of it. ;)

    2. Re:NorthWest Passage? What The Hell? by bigfatlamer · · Score: 0, Troll

      10,000 dumbfucks don't make it right.

      BFL
      (burning some karma)

      --
      There's one thing computing teaches you, and that's that there's no point to remembering everything.
      --Doug Copland
    3. Re:NorthWest Passage? What The Hell? by Anonymous Coward · · Score: 0

      Yes, but how exacly did they "trek through the Northwest Passage". They set out in hopes of finding one, but in the end proved that there was no inland Passage. In anycase, 'trek' generaly implies moving overland, and the Passage is by definition a body of water. When I first read the article, I almost wondered if that bit was intened as a joke.

      More here:
      http://www.wshs.org/lewisandclark/water_route.htm

    4. Re:NorthWest Passage? What The Hell? by KewlPC · · Score: 1

      Funny, I don't EVER remember hearing about Lewis & Clark trekking through the Northwest Passage when my class was learning about Lewis & Clark in school, because the Northwest Passage doesn't exist!

      Lots of people died while trying to find it, though.

      Here's the (abridged) story of Lewis & Clark:

      After greatly expanding US territory via the Louisiana Purchase (the Louisiana Purchase covered a lot more land than what is now known as the state of Louisiana, FYI), in 1804 then-president Thomas Jefferson sent Lewis & Clark to explore the new territory.

      Their expedition ended up taking just over 2 years and took them all the way to the Pacific coast.

      However, the article does say:
      " 'The maiden voyage of Deep Flight Aviator in San Francisco Bay,' they said, 'ranks with the Wright brothers' flight at Kitty Hawk and Lewis and Clark's trek through the Northwest Passage.' "

      The article is just quoting the guys who built the sub. It isn't the journalist who is incorrect, but rather the sub's designers, or so it would seem.

    5. Re:NorthWest Passage? What The Hell? by drg55 · · Score: 1

      I thought it was overhyped but then the story was sarcastic.

      Its not a new concept but would be a nice toy.

  58. I've already heard about one of those subs... by m3573 · · Score: 1


    ... in a 1991 science-fiction book, called "The Steel Albatross" written by an ex-astronaut (here, a Google search for it).

    That Steel Albatross worked like a glider, using ballast to gain velocity or emerge, and was used as a spy sub. You can imagine the sense of deja-vu when i saw the article's photos...

    The pilot controlled it using a PC... He had to reboot once, before the story was over, of course :)

  59. Sure... by pclminion · · Score: 2, Informative
    Here.

    No need to be rude...

    1. Re:Sure... by BLAG-blast · · Score: 1
      No need to be rude...

      Sorry.

      --
      M0571y H@rml355.
  60. Marianas Trench? by Anonymous Coward · · Score: 0

    Can we keep a healthy language over here?

    There's little script kiddies all over the place!

  61. Gungan Bongo? by spaten-optimator · · Score: 1

    Huh? That thing looks a little like the Gungan Bongo from Episode I. Hopefully, the flying sub doesn't come standard with an annoying muppet.

    --

    --
    Disclaimer: The above statement probably includes half-truths, because real truth is too complicated.
  62. Ok, this is cool. by Anonymous Coward · · Score: 0

    And it brought memories...

    Stingray...

    Marine Boy...

  63. Marine Boy of the Ocean Patrol by Anonymous Coward · · Score: 0

    Anyone else remember that great anime series from the 60's? Kind of like Speed Racer underwater. Of course THEIR subs could also fly through the air as well as underwater and had freakin laser beams too. And that Neptina was one hot mermaid chick. Time to get back to working on that OxyGum patent...

  64. Looked a litte more than gay.. by Anonymous Coward · · Score: 0

    Looked at the photos! And in San Francisco of all places.. Hmmm.. Is it powered by linux? Maybe the Gay Linux conspiracy has some merit fellows?

  65. Right... by Anonymous Coward · · Score: 0

    I forgot about that part :D -thebigmacd

  66. Bull: Re:Buoyancy and "flight" by WolfWithoutAClause · · Score: 4, Informative
    Unlike in true flight, where it doesn't require more energy to maintain an altitude of 2000 feet than 1000,

    Yes it does, the air is thinner up there.

    it takes incomparably more energy to maintain a depth of 2000 feet compared to 1000 if you're not using buoyancy control.

    A submarine displaces its own volume of water, and has a lift proportional to the difference between its weight and the weight of that volume of water at that depth. The density of the sea water hardly varies between the surface and the bottom (the pressure goes wayyyyy up, but water is largely incompressible), so the buoyancy is nearly the same.

    Therefore the amount of energy needed is largely the same also; independent of altitude, for a fixed volume submarine, since you're only really fighting buoyancy to go down.

    Also, in flight a wing uses reduced air pressure above the curved top of the wing surface (Bernoulli's Principle) for most of its lift. Does anyone know if this effect applies in water? Intuitively it seems like it would not.

    Gee, I don't know, mister; ever heard of a propeller? That's a set of wings that rotate under water. Get a clue.

    --

    -WolfWithoutAClause

    "Gravity is only a theory, not a fact!"
    1. Re:Bull: Re:Buoyancy and "flight" by harangutan · · Score: 1

      Gee, I don't know, mister; ever heard of a propeller? That's a set of wings that rotate under water. Get a clue.

      Thank you for the polite answer. I had supposed that a propeller might well work as much by deflection of water as the bernoulli principle, much as a household fan does.

    2. Re:Bull: Re:Buoyancy and "flight" by Anonymous Coward · · Score: 0

      The bernoulli works cecause of differences in pressure as air travels over/unde the wing. Sinc water can not be compressed, it does not apply.

      It works more like the control surfaces on an airplane than the wings. There are force components along and perpendicular to the axis of the craft. Same goes for a prop.

    3. Re:Bull: Re:Buoyancy and "flight" by skyhawker · · Score: 1
      Unlike in true flight, where it doesn't require more energy to maintain an altitude of 2000 feet than 1000,


      Yes it does, the air is thinner up there.


      Not in my experience. Sure the air is thinner, but you end up flying faster to compensate. Aircraft measure airspeed using a concept called indicated airspeed, which basically just reflects the amount of air whizzing by. Within a pretty large range of altitude, most jets use the same fuel flow to maintain the same indicated airspeed, and the indicated airspeed is really what counts when computing lift. So if I can keep airborne at 200 KIAS (knots indicated airspeed) at sea level, I can pretty much do the same at 20,000 feet. My KTAS (knots true airspeed) will be higher, of course. But the thrust required, and the corresponding fuel flow will remain about the same.
      --

      The best diplomat I know is a fully activated phaser bank.
      -- Scotty.
    4. Re:Bull: Re:Buoyancy and "flight" by KewlPC · · Score: 1

      And does a helicopter also work by forcing air downwards?

      Hint: no

    5. Re:Bull: Re:Buoyancy and "flight" by KewlPC · · Score: 1

      Let me explain: each rotorblade on a helocopter is a wing than spins. The lift generated by these rapidly spinning wings is what keeps the helicopter airborne. The side effect of this is that air gets forced downward, but this byproduct of the spinning rotorblades is unused.

    6. Re:Bull: Re:Buoyancy and "flight" by WolfWithoutAClause · · Score: 1

      Why not then? As far as I can see off-hand that's how it works.

      --

      -WolfWithoutAClause

      "Gravity is only a theory, not a fact!"
    7. Re:Bull: Re:Buoyancy and "flight" by WolfWithoutAClause · · Score: 1

      Yeah, ok, I blew that one, it cancels nicely. But by the same token, no extra energy is needed at 2000 ft underwater than 1000 ft underwater to go up or down; which was the whole point of my post really.

      --

      -WolfWithoutAClause

      "Gravity is only a theory, not a fact!"
    8. Re:Bull: Re:Buoyancy and "flight" by WolfWithoutAClause · · Score: 1

      No it isn't. From Newtons third law, the fact that the helicopter is being forced up, means the air has to be forced down. It's an inevitable, and desirable consequence.

      --

      -WolfWithoutAClause

      "Gravity is only a theory, not a fact!"
    9. Re:Bull: Re:Buoyancy and "flight" by Anonymous Coward · · Score: 0

      Just to add to a good point...

      Thin air is good for getting higher true airspeeds out of a given amount of thrust. The reason we're not all flying around at 60'000 feet is that our fire breathing engines run out of poop as the air gets thinner (and mach effects, but that's beyond the scope of /.).

      If you give up the fire breathing part for power (like Helios), you can see some pretty impressive altitudes.

      Which is a long way of saying, "It doesn't take more power to fly higher, it just takes more than you have."

    10. Re:Bull: Re:Buoyancy and "flight" by harangutan · · Score: 2, Informative

      According to this, a propeller on a boat works by pushing water backwards (which is why, I suppose, it's often called a "screw" rather than a propeller). A prop on a plane blows air strongly backwards as well, but I don't know if that's the chief force pushing the plane forward or if the bernoulli principle (acceleration of air passing over the forward surface of the prop creating a draw, or vacuum) is what's doing it.

      I admit I was totally wrong about the buoyancy issue in my first post, BTW. Simple Archimedes displacement issue, and in an incompressible fluid, neutral buoyancy is the same at all depths. I regret the erroneous post.

    11. Re:Bull: Re:Buoyancy and "flight" by KewlPC · · Score: 1

      No no no.

      Each of the rotorblades is a wing. It generates lift by creating a low-pressure area above itself, just like an airplane's wing. This lift is what enables the helicopter to fly.

      While the air being forced downwards probably helps, that alone isn't what keeps the helicopter airborne.

    12. Re:Bull: Re:Buoyancy and "flight" by WolfWithoutAClause · · Score: 1
      At high altitude, the air being forced down and the lift are two sides of the same coin. It's the same with fixed wing aeroplanes too. You HAVE to throw air down to stay in the air. The low pressure area is caused by the air above the wing curving to point at the ground. As it does this it speeds up and that reduces the pressure. But you also get high pressure air on the underside; and that's actually most of the lift, particularly at low speeds. Again, the high pressure is associated with turning the airflow towards the ground.

      At low-moderate altitude you get ground effect; this greatly reduces the air flow and greatly increases lift. The aircraft acts more like a hovercraft, generating high pressure under the wing.

      --

      -WolfWithoutAClause

      "Gravity is only a theory, not a fact!"
    13. Re:Bull: Re:Buoyancy and "flight" by mamahuhu · · Score: 1

      Finally someone gets it....

      Flight is caused by air being pushed down and the airplane goes in the opposite direction - up. This is the Coanda effect - and it is also the reason sailboats sail. As a long time sailor I know from experience.

      This website has it all in full.

      http://www.jefraskin.com/forjef2/jefweb-compiled/p ublished/coanda_effect.html

      This notes the following: -

      While Bernoulli's equations are correct, their proper application to aerodynamic lift proceeds quite differently than the common explanation.

      That said - it should be noted that this submarine DOES fly like an airplane - by using plane to deflect the water like a wing. Given than water is incompressible the Bernoulli effect can not apply.

      Cool machine - I want one.

    14. Re:Bull: Re:Buoyancy and "flight" by mamahuhu · · Score: 1

      Yup you're right.

      Funny how some people are convinced that the Bernoulli principle keeps a plane flying - it is the entrained air cause by the shape of the wing and the angle of attack that produced the lift.

      The angle of attack of the rotor blades (or wings) force air down causing the chopper to fly. At low alitudes there is also a certain ground effect and backwash that helps - but out of ground effect it is the push of the air.

      Think about this - the personal helicopter recently seen on Slashdot can't use a wing Bernoulli type principle - it must force air in the opposite direction to go up. Simple rilly.

    15. Re:Bull: Re:Buoyancy and "flight" by Brown · · Score: 1

      Gee, I don't know, mister; ever heard of a propeller? That's a set of wings that rotate under water. Get a clue.

      Props are not generally wings in the Bernoulli sense as they are deflectors (they produce thrust through being set at an angle, rather than through their curvature).
      However, the bernoulli effect does still operate fine under water; try waving a spoon around when doing the washing up, it generates a surprising amount of lift due to its curvature.

      - Chris

    16. Re:Bull: Re:Buoyancy and "flight" by Nick_Gunz · · Score: 1
      Gee, I don't know, mister; ever heard of a propeller? That's a set of wings that rotate under water. Get a clue.

      Actually, propellers designed to operate in water mostly don't act like wings. Rather they operate on the 'screw' principle (so we call them 'screws'). This was an issue when they were designing the first aeroplanes because they couldn't use the screw principle in air (would take too much energy, I think) so they had to come up with a different idea (like having little wings attached to a spinning hub).

      That said, the Bernoulli principle works just as well in water as it does in air. You can see it working in a lot of places, for example, the hydroplanes of conventional submarines, the hydrofoils of hydrofoil boats and the centreboards of sailing dinghies.

      - NG

    17. Re:Bull: Re:Buoyancy and "flight" by pherthyl · · Score: 1

      Actually the bernoulli effect contributes very little to the lift of an airplane. The real source of lift is something called the Coanda Effect http://humane.sourceforge.net/published/coanda_eff ect.html

      In any case, the bernoulli effect contributes nothing to moving a plane FORWARD.

    18. Re:Bull: Re:Buoyancy and "flight" by WolfWithoutAClause · · Score: 1
      Given than water is incompressible the Bernoulli effect can not apply.

      I'm pretty sure it still applies, since it is a thermodynamic effect that comes about at the molecular level- water will still experience it.

      But as you say, the Coanda effect is pretty important, more so than the Bernouilli; but the ram effect under the wing is usually even more important.

      --

      -WolfWithoutAClause

      "Gravity is only a theory, not a fact!"
    19. Re:Bull: Re:Buoyancy and "flight" by KewlPC · · Score: 1

      I stand corrected.

      However, a question:
      The high pressure area pushing the helicopter (or plane, or whatever) into the low pressure area above it is what keeps the aircraft in the air, yes? In that case, the high pressure area also pushing air downward is just a side effect, and doesn't directly affect the aircraft unless it is at a low altitude, right? In other words, the high pressure area forcing the aircraft upwards into the low pressure area is the desired effect, and the equal and opposite reaction of the high pressure air also going downwards is unused much of the time.

      If that is the case, how am I wrong? Aren't we both arguing the same thing?

      There are a lot of people (I am not one of them) who are convinced that the rotorblades on a helicopter work the same way as a household fan, or a ship's screw, which is incorrect; rotorblades are just wings that spin. I thought you were agreeing with them (read: you too thought that rotorblade = screw that's in the air), but now I see that you aren't. Sorry.

    20. Re:Bull: Re:Buoyancy and "flight" by WolfWithoutAClause · · Score: 1
      In that case, the high pressure area also pushing air downward is just a side effect, and doesn't directly affect the aircraft unless it is at a low altitude, right?

      If you want to know how much lift an aircraft generates, measure what the overall momentum of air going down is; that's numerically equal to the lift. There is a direct relationship.

      --

      -WolfWithoutAClause

      "Gravity is only a theory, not a fact!"
  67. Re:You Little Punk by Anonymous Coward · · Score: 0

    I was 20 years old and watched the Challenger accident live. Your lame attempt at humor missed.

  68. Tight Spaces by Cheesewhiz · · Score: 1
    That has to be the single most claustrophobic underwater exploration experience ever. Period.

    How many people do they actually expect will be able to ride in that thing without going spastic? The very thought of putting myself 100 feet underwater in that thing sends me into overload.

    --

    -----
    "Cogito Eggo Sum: I think, therefore, waffle."
    1. Re:Tight Spaces by cubicleguy · · Score: 1

      I don't think the water of SF Bay is all that clear, either, so I wonder just how much good the dome windows would do anyone who got more than just a few feet underwater.

  69. My uncle by Anonymous Coward · · Score: 0

    My uncle bought an old Soviet Diesel (circa 1950 design) back in 1994 for scrap. It cost him only 25 thousand and he was gonna bring it here and turn it into a floating restaurant, but Uncle Sam said fuck no so he sold it to the S. Koreans for 500 thousand and they rebuilt it into a museum piece (I think). I heard the retro fit cost them about 2 million. So I dont think a personnal sub is silly or out of the question. 2 million is a lot of money, but I bet a cheaper less accurate rebuild could have cost them under a million and would have been more than workable.

    1. Re:My uncle by Anonymous Coward · · Score: 0

      I meant 250 thousand not 25 typo sorry

  70. No Way! by Anonymous Coward · · Score: 1, Informative

    I worked with these guys in high school up into this summer. H.O.T and Autodesk did some agreement with my high school where we got copies of Autodesk Inventor for free in exchange for drawing parts for the sub. It was a big PR thing for Autodesk. My classmate helped design the rudder system (Hawkes called it as fine as a "swiss watch") and me and a couple buddies modeled the mechanical flight system/joystick. I still have the Inventor files(no inventor though :( ) My friend who made the rudder eventually went to UCB and stayed on with the sub crew, designing and modelling parts. He got me a job with H.O.T's sister company which makes remote control gun platforms. :) Last I saw the sub it was about 80% complete. It's crazy they got it done...there was a joke around the gun company that it would never be finished. Hopefully I will go back and work for them this summer :-). Maybe I can get a ride...lol

  71. Bill by Anonymous Coward · · Score: 0

    Is that Bill Gates in cockpit #1?

  72. I've got better... by Anonymous Coward · · Score: 0

    Blue1000_thrusts-Caplet
    SF Brown Cucumber Seeker
    GayNautilous
    In The Navy...
    400fathom-homo
    two fags in a pod

    and my favorite...

    HomoJet - "Our mission is to explore the depths of Gaya's vents *stretching* from the gaseous crusty ventral deep-ocean environments to the many excretions on the surface."

  73. Yep - and you can get a plastic model of it by Anonymous Coward · · Score: 0

    Just toss the parts into your tub. No assembly required. :-)

  74. I *saw* it - and damn near started crying by Anonymous Coward · · Score: 0
    "It appears we have a major malfunction" is the understatment of all history.

    And yet...

    Q: Why are the dolphins off FL so smart?

    A: They got a new teacher

    Q: What's worse than finding broken glass in baby food?

    A: Finding astronaut in your tuna.

  75. No by Anonymous Coward · · Score: 0

    No, that was a conventional propeller sub that just happened to look like a shark.

  76. GayQuest - to Uranus and beyond! by Anonymous Coward · · Score: 0

    Woah.

    Look at the fartboxes on the two men in that there submersible dildo!

  77. SF and subs go together by Anonymous Coward · · Score: 1, Funny

    All you lurking sub-mariners know why!

  78. Submarine races at Stanley Park by Anonymous Coward · · Score: 0

    I guess this has nothing to do with going to see the Submarine Races at Stanley Park in Vancouver????

  79. dealers by Anonymous Coward · · Score: 0

    so will this help the drug trade?

    I sure hope so, the prices i'm paying are outlandish.

    make drugs not war.

  80. Re:You Little Punk by Anonymous Coward · · Score: 0

    I was ten years old and thought it was pretty cool. Especially all the cool jokes that came out in the weeks afterward.

    What does NASA stand for?
    Need Another Seven Astronauts!
    What were Christa McAuliffes last words?
    Whats this button do?

  81. Wow! More HoMorines! by Anonymous Coward · · Score: 0

    I better start packing my bags and my fudge; I'm headed to San Francisco!

    I hope I can meet ol' Kike an' see if he'll gimme a ride on his next trip to the Gay BSDM Parade held annualy in San Francisco.

    Oh Boy! My bisznatch is everyone's bisnatch, just letting you al' know.

  82. Whats long and hard and full of seamen? by Anonymous Coward · · Score: 0

    Heh, am I the first to think of this joke?

    nice project, however to aid geek appeal, the should have chicks in skin suits or somthing....oh wait this some San Fran Queen thing?

  83. A Spam blast from the past! Why Own a Yacht? by dougmc · · Score: 1
    You know, it wasn't that long ago that we were all getting spammed about personal submarine vaporware!

    Looking to buy a Yacht?

    Why?

    They only work on the water.

    You could have a Personal Luxury Submarine for just a little more.

    And enjoy all the Ocean. Up to 1000' and up to 30 days under.

    Check it out at:

    http://members.aol.com/luxurysubs

    and now somebody's actually made one!

    (fortunately, the original web page is not up anymore.)

  84. Blue Angel by jdkane · · Score: 1

    Where I come from, a Blue Angel ain't an airplane.

  85. SeaQuest DSV by doorbot.com · · Score: 1

    Seaquest is coming true.. I wonder if it comes with an ultra smart dolphin who has a translater hooked to it so i can have conversations with it.

    I wonder if it comes with an "elite" password cracker otherwise known as Lucas Wolenczak. Yes, the man who could guess your password, no matter how complex, in three tries or less.

    Be aware ladies, despite his youthful looks, he's actually 29!

  86. Air behaves as an incompressible fluid as well. by skyhawker · · Score: 1

    I hate to burst your "bubble," but from the standpoint of aerodynamics, air behaves as an incompressible fluid until you get close to the speed of sound. So air and water work in much the same way at typical speeds.

    --

    The best diplomat I know is a fully activated phaser bank.
    -- Scotty.
    1. Re:Air behaves as an incompressible fluid as well. by thrillseeker · · Score: 2, Informative
      I hate to burst your "bubble," but from the standpoint of aerodynamics, air behaves as an incompressible fluid until you get close to the speed of sound.

      Ah, no. Air is compressible until approaching the speed of sound - which is why the speed of sound is what it is. That's also why there is a "shock wave" - since the air is not able to get out of its own way, and is also why it was originally believed that one couldn't travel faster than sound (though it was obvious that there were objects doing so, such as meteors, etc.). Approaching the speed of sound the induced drag rises rapidly - flying through that speed and continuing supersonic required gaining an understanding of how to reduce that drag (the "Coke bottle" shape of some aircraft designed during the 50's was one technique), and also gaining an understanding that the lift characteristics and center-of-lift point would shift - attention to design insured that this point did not deviate farther from the center-of-gravity than the flight control abilities of the time (i.e. - the pilot) could reasonably handle - think about the moment arm becoming greater as the difference between those two points increases. Also, it got much easier as we learned to build engines that could provide greater thrust.

    2. Re:Air behaves as an incompressible fluid as well. by skyhawker · · Score: 1

      According to this page, air is essentially incompressible until roughly 1/3 the speed of sound. I was wrong about where the onset of compressibility takes place, but I was clearly correct about the notion that air acts incompressibly at low airspeeds and exhibits compressibility only at higher airspeeds.

      Furthermore, although you throw a bunch of terms around very nicely, you clearly don't know what you're writing about. Induced drag has nothing to do with airspeed -- that's form or parasitic drag. Induced drag is the drag induced by the creation of lift, and can be thought of in terms of the backward tilt of the lift vector as you increase g loading, as in a high performance turn. Induced drag is one of the two main reasons that fighters need afterburners -- the other being in order to accelerate quickly to top speed.

      --

      The best diplomat I know is a fully activated phaser bank.
      -- Scotty.
  87. Re:You Little Punk by Anonymous Coward · · Score: 0

    Live as in at the Cape or live as in sittin in front of the tube?

    Either way, big deal. A good percentage of the population saw the event. Spare us the posin.

  88. Flies like a Penquin by Anonymous Coward · · Score: 0

    Yeah Tux...

  89. I was wondering how long it would take. . . by kfg · · Score: 1

    before someone connected my penguin observation to Linux.

    Let's just say that "Blue Screen of Death" takes on a whole new meaning 1000 feet below the surface of the sea.

    Would *you* risk it?

    KFG

    1. Re:I was wondering how long it would take. . . by Anonymous Coward · · Score: 0

      There is no BSOD in Win2k or XP. You're a clusterfarttard.

  90. Me too... by dbCooper0 · · Score: 1
    Yup. Happened to me this last week, as well as terribly long waits between pages. I had three mod points with three days left - they disappeared on a page reload.

    Perhaps slashcode is not tolerating a longer delay between Perl scripts...not a Perl coder, so I dunno...but I've been cancelled out of a couple MetaMod submissions in the last two weeks as well.

    --
    db
    Cig:
    ôô
    /`
  91. A sub did that in 1960 by Animats · · Score: 1
    Back in 1960, Trieste, a bathyscaphe with two people aboard, dove to 37,800 feet, the deepest spot in the world's oceans.

    Like the moon, no one has been there since.

  92. Re:You Little Punk by Anonymous Coward · · Score: 0
    I was 20 years old and watched the Challenger accident live. Your lame attempt at humor missed.

    Lay off the liquor, gramps.

  93. Re:Buoyancy and "flight"Bernoulli's principle by MoFoYa · · Score: 1

    in water the same aerodynamic rules apply to a degree. the curvature of the wing still causes the air/water to travel a greater distance over the curved top of the wing, therefore moving faster than tha air/water on the flat bottom of the wing. this creates the low pressure area on top of the wing. -- I would consider turning the wing over for underwater flight. Then the wing could assist a bit with bouyancy controll(assuming the sub tends to float "out of the box"). This becoming a mute point if you want to remain stationary at a fixed depth.
    question: Is the water wing more efficient due to water density being a constant as opposed to air which can be compressed? Perhaps more lift but also more drag?

  94. Re:I've got better...what the f*#k? by Anonymous Coward · · Score: 0

    Knock off the fag jokes please! Ya gotta right to say what ya please but if I want to experience anti-gay rhetoric I'll go the "700 club" website.
    Let's please not disparage types of people here.

  95. Re:This could be a terrorist weapon... by Aglassis · · Score: 1

    Reminds me of the story of the Turtle. Very similar tactic, only over 200 years ago.

    --
    Suddenly, the hairy finger of a familiar monkey tapped me on the shoulder. It was time.--G. T.
  96. Re:You Little Punk by Craig3010 · · Score: 1

    by Anonymous Coward
    'nuff said

  97. Re:Deep sea for everyone! - SCUBA's 2nd best :P by caveat · · Score: 1

    SCUBA is the best thing you'll ever do with your clothes on.

    nope, sorry, i have to argue with you on that one. i have SSI Deep Diver and PADI Nitrox certs; i'm working on Drysuit and Decompression so I can dive the doria next summer. i would have agreed with you on SCUBA being that much fun, but last summer i took a trip to SDLI...screw that, there is *nothing* you can do in the water that is anywhere near the rush you get stepping out onto 13,500 feet of air - i could see Long Island from manhattan to montauk. i still love SCUBA, but now I'm trying to scrape together /another/ $3000 for my USPA license and $5000 for my rig...*sigh* (not that tech dive gear is any cheaper)

    --

    Facts do not cease to exist because they are ignored. - Aldous Huxley
  98. Thanks, I'll look for that. by kfg · · Score: 1

    His New Yorker essay on the plane is one of my favorite bits of magazine writing. Obviously he was working on the book at the time too.

    KFG

  99. Re:I've got better...what the f*#k? by Anonymous Coward · · Score: 0

    Knock off the fag jokes please!

    Ah, c'mon, have a sense of humor! Of course, the jokes in question are really stupid, so maybe that's not such a good suggestion after all...

  100. Re:Deep sea for everyone! - SCUBA's 2nd best :P by Anonymous Coward · · Score: 0

    As a former U.S. Collegiate national skydiving champion and a former professional diver; and as the President of U.S. Submarines, Inc., I can tell you that having your own personal luxury submarine is way cooler, and way more fun than diving or skydiving - at least when you get a little older.

    Cruising the depths with a gorgeous babe, some champagne, good music and the uw lights going simply cannot be beat. It's an amazing experience. See ussubs.com

  101. once again.... by Anonymous Coward · · Score: 0


    He's not the one trolling you. I am. Reposting his information does nothing to keep me from replying to you. In fact, the only thing is does do is confirm again and again that you:

    1- are troll-able, at the same time you mock other people for replying to your trolls.

    2- are immature. like a six year old. although, I had guessed that already.

    3- are borderline stalker, for even tracking that poor kid down. Remember, he's probably just an immature kid like yourself.

    1. Re:once again.... by Bowie+J.+Poag · · Score: 1



      That last troll was posted by:


      McDaniel, Scott mcdev@mcdev.com, pipebomb@pipebomb.net

      McDaniel Development
      2139 Old Highway 5 South, and..
      637 Riverside Dr.
      Ellijay, Georgia 30540
      United States
      (706) 698-5112

      Feel free to call this troll. He's lives with his mom, and that's her voice in the answering machine message. Every time Mr. McDaniel decides to troll, another copy of his personal info will be posted immediately afterward.

      --
      Bowie J. Poag

    2. Re:once again.... by Anonymous Coward · · Score: 0

      why don't you post your phone number so i can tell YOU over the phone that i'm not that kid.

      or better yet...call me: 617-796-8562