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World's Largest Aircraft Completes Its First Flight (cnn.com)

The world's largest aircraft has finally completed its first flight after months of preparation and years of searching for funding. The Airlander 10 as it's called spent 20 minutes in the air on Wednesday, landing safely at Cardington Airfield north of London. CNNMoney reports: "Part airship, part helicopter, part plane, the 300-foot long aircraft is about 50 feet longer than the world's biggest passenger planes. The Airlander, made by British company Hybrid Air Vehicles, has four engines and no internal structure. It maintains its shape thanks to the pressure of the 38,000 cubic meters of helium inside its hull, which is made from ultralight carbon fiber. The aircraft was originally designed for U.S. military surveillance. But the project was grounded in 2013 because of defense spending cuts. [The team behind the giant blimp-like aircraft] said the aircraft could carry communications equipment or other cargo, undertake search and rescue operations, or do military and commercial survey work. The Airlander can stay airborne for up to five days at a time if manned, and for more than two weeks if unmanned. It can carry up to 10 tons of cargo at a maximum speed of 91 miles per hour. The aircraft doesn't need a runway to take off, meaning it can operate from land, snow, ice, desert and even open water." You can view the historic flight for yourself here (Warning: headphone users beware of loud sound).

190 comments

  1. largest aircraft target by turkeydance · · Score: 1

    "hey, y'all! watch this!"

    1. Re:largest aircraft target by PolygamousRanchKid+ · · Score: 4, Funny

      "hey, y'all! watch this!"

      Meanwhile, North Korean garlic, chili and cabbage head leader, Kimchi Jong-Un, has announced that they have successfully launched a giant rocket pin, which intercepted "a real big ass balloon".

      --
      Schroedinger's Brexit: The UK is both in and out of the EU at the same time!
    2. Re:largest aircraft target by Anonymous Coward · · Score: 0

      Most of the time, it'll be out of small arms range. Bullet holes will just add slow leakage. And good luck getting a missile lock on a big cold wibble.

    3. Re:largest aircraft target by Anonymous Coward · · Score: 1

      Is kimchi not Korean, and not garlic, chili & cabbage?

      And are you just a bit thin skinned?

    4. Re:largest aircraft target by andreas.hummelbrunne · · Score: 1

      Just don't use a heat-seaking missile.

    5. Re:largest aircraft target by clubby · · Score: 1

      Well, a heat-seeking missile won't lock, but radar-guided would, and laser-guided or wire-guided missiles don't need to lock. Also, a lot of air-to-air warheads are wrapped in a kind of chain-link fence structure that would rip long gashes in the blimp's skin at detonation.

    6. Re:largest aircraft target by flink · · Score: 1

      Why would anyone need to shoot it down? The whole thing is a bomb!. /s

    7. Re:largest aircraft target by budgenator · · Score: 1

      Most "Radar Guided" are really semi-active homing, which means they home in on microwave energy radiated from an illuminating radar and reflected back from the target to the missile. The interesting part of this is the Airlander has a carbon-fiber skin, and carbon is a microwave sponge; so the radar cross-section is going to be pretty small, I wouldn't be surprised if commercial versions have Radar reflectors installed to make them more visible. In fact the airlander might be a very effective anti-radiation weapons platform.

      --
      Apocalypse Cancelled, Sorry, No Ticket Refunds
    8. Re:largest aircraft target by clubby · · Score: 1

      carbon is a microwave sponge; so the radar cross-section is going to be pretty small

      Relative to its size, sure, that's at least plausible if not outright likely, but that thing is enormous. I'm pretty sure any SARH missile made in the last 30 years would be able to hit it.

    9. Re:largest aircraft target by budgenator · · Score: 1

      Have there been any in the last 30 years? Patriot first fielded in 1981, based on a 1969 design, repalcing the Nike-Herc in the MIMAD role and the HAWK in the MEMAD role. Turning on an illuminator from an aircraft is pretty suicidal in today's threat environment.

      --
      Apocalypse Cancelled, Sorry, No Ticket Refunds
    10. Re:largest aircraft target by Anonymous Coward · · Score: 0

      Racism requires one to promote a race over another. He did no such thing.

  2. Waste of helium by Anonymous Coward · · Score: 3, Insightful

    Helium is a rare element on Earth, despite being common in space. We need to be conserving our helium supplies. Why are we wasting helium on stuff like this?

    1. Re:Waste of helium by Anonymous Coward · · Score: 3, Funny

      we should switch to Hydrogen, it's easier to get

    2. Re:Waste of helium by Anonymous Coward · · Score: 5, Insightful

      So this is a waste, but party balloons ore ok? Because I guarantee a lot more He is wasted on party balloons than will ever be used on these aircraft, by many orders of magnitude.

    3. Re: Waste of helium by Anonymous Coward · · Score: 0

      Why do we need to reserve Helium?

    4. Re:Waste of helium by Anonymous Coward · · Score: 1

      Why do we "waste" a lot of our resources?
      How much rubber and fuel is burned up on a "indy 500" race just so people can drive around in a big oval for hours? That fuel could have went to better uses.

      Humans waste things for much less, this is a portable aircraft with a good carry capacity.

    5. Re:Waste of helium by Big+Hairy+Ian · · Score: 1

      The Helium used in party balloons is highly impure and it is not cost effective to refine. One would hope that this aircraft is using the same impure Helium.

      --

      Build a Man a Fire, and He'll Be Warm for a Day. Set a Man on Fire, and He'll Be Warm for the Rest of His Life.

    6. Re: Waste of helium by drakaan · · Score: 2
      --
      "Murphy was an optimist" - O'Toole's commentary on Murphy's Law
    7. Re:Waste of helium by tripleevenfall · · Score: 3, Funny

      Sure beats those non-portable aircraft!

    8. Re:Waste of helium by vakuona · · Score: 1

      Why do we "waste" a lot of our resources?

      How much rubber and fuel is burned up on a "indy 500" race just so people can drive around in a big oval for hours? That fuel could have went to better uses.

      Humans waste things for much less, this is a portable aircraft with a good carry capacity.

      I think you wil find that the amount of fuel "wasted" in an actual Oval race is less than the fuel used by all the supporters who flock to watch said race.

      Motorsports, at least at the top level, used a negligible amount of fuel compared to other fuel uses.

    9. Re:Waste of helium by Anonymous Coward · · Score: 0

      Can we make solid objects that are lighter than air, and yet strong enough to withstand atmospheric pressure? If not, then without helium we are basically out of safe options for lighter-than-air aircraft.

    10. Re:Waste of helium by Anonymous Coward · · Score: 0

      A 747 doesn't have the endurance, but it has a carrying capacity of 52t.

    11. Re: Waste of helium by Anonymous Coward · · Score: 0

      For cryogenic machines and research.

    12. Re:Waste of helium by GuB-42 · · Score: 1

      So this is a waste, but party balloons ore ok? Because I guarantee a lot more He is wasted on party balloons than will ever be used on these aircraft, by many orders of magnitude.

      It depends on how many of such aircraft are made but I estimate the number of orders of magnitude to 2 or 3 (100x to 1000x more). One Airlander 10 has the equivalent of 2.5 million party balloons inside it, though I suppose this helium can get pumped out and recycled at the end of life.
      But helium as a lifting gas accounts for only a small part of total usage, and party balloons are only part of it (maybe half, to about 5%).

      Possibly one of the biggest waste is in MRI machines. They use up several times more helium than party balloons, or even all helium balloons ever will. And the reason they are so wasteful is the same as the reason why we have helium party balloons : helium is cheap now.
      As a result, instead of designing complex system so that helium is properly recycled, they prefer to waste it and refill regularly. To put things into perspective, a single MRI machine can contain about enough helium to fill up about half a million party balloons. And that's pure helium, not "balloon gas".

    13. Re:Waste of helium by BarbaraHudson · · Score: 0

      Actually, we could do so safely. Sure, hydrogen burns, but only in the presence of oxygen. An envelope filled with N2 around each hydrogen cell would make a Hindenburg-style explosion pretty much impossible.

      Also, because the H2 molecule, being composed of two atoms, is twice as large as the He atom (helium doesn't pair with itself to form molecules), which only has one atom, it will take MUCH longer for the hydrogen to escape through the pores of the gas bag/lifting cell. Now because a hydrogen atom is 4x lighter than a helium atom, a volume of hydrogen molecules is still halt the weight of the same volume of helium atoms.

      The atomic weight of a helium atom (4.002) is approximately four times that of an individual hydrogen atom (1.007), but since gaseous hydrogen is a diatomic molecule containing two hydrogen atoms (H2), helium gas is only twice as heavy as hydrogen gas.

      Hydrogen is cheaper, gives more lift, and you can even make it on site from electrolysis of H2O, same as some large volume muffler shops do to get the oxygen for their oxy-acetylene torches because it works out cheaper than bottled compressed O2.

      LZ-126/U.S.S. Los Angeles gives a real world example of the difference between operating the same ship with helium versus hydrogen. When the German-built LZ-126 flew from Germany to the United States for delivery to the U.S. Navy in 1924 it was inflated with hydrogen, and the ship made the flight from Friedrichshafen, Germany to Lakehurst, New Jersey — 5,006 miles — nonstop. When the United States Navy operated the same ship with helium, as U.S.S. Los Angeles, its range was limited to 3,925 statute miles and it could not have made the same transatlantic flight. And never again did the ship fly as long as it did on its delivery flight with hydrogen, which lasted 81 hours, 32 minutes; ZR-3’s longest flight with helium was a little over 48 hours.

      Not only does helium suck as a lifting gas, if the Hindenburg had used helium instead of hydrogen,. it would have never got ff the ground.

      --
      "Transparent" is a shit show that trades on every stereotype going. A man in drag is NOT a transsexual.
    14. Re:Waste of helium by pastafazou · · Score: 2

      On one hand you argue about the efficiency of hydrogen versus helium in terms of atomic weight, but then you propose a solution to the volatility of hydrogen by proposing all cells are surrounded by an envelope of N2, which is far heavier than Helium and would likely undo any advantage gained by using hydrogen over helium. It's also worth pointing out that there's nothing stopping your "protective" envelope from being punctured, allowing the hydrogen to mix with oxygen, kind of like how the iceburg punctured enough of the watertight compartments on the Titanic to sink the "unsinkable" ship.

    15. Re:Waste of helium by dj245 · · Score: 1

      The Helium used in party balloons is highly impure and it is not cost effective to refine. One would hope that this aircraft is using the same impure Helium.

      Not always. According to this helium wholesaler, grade 4.5 (99.995%) gas is often used in the balloon industry. Granted, getting the "5th nine" is a lot more costlier than getting to 4 nines, but I would not use "highly impure" to describe that level of purity. Most industrial uses use 99.997%. Anything higher than that is research/military grade and probably relatively low-volume in comparison to the welding shops, cryogenic cooling systems, and manufacturing users using 99.997% or lower.

      --
      Even those who arrange and design shrubberies are under considerable economic stress at this period in history.
    16. Re:Waste of helium by Anonymous Coward · · Score: 0

      Because recycling cost money and time past accomplishing the goal. Once the goal has been completed we don't want to do work to clean up as this doesn't appear to add [immediate] value. This is practically a human instinct (small children do this when not instructed to do otherwise).

      Further examples include people that fix computer systems and don't re-enable security protocols afterwards and machine maintenance where interlocks aren't re-enabled after the work completes. A related behavior is the human tendency to not implement preventative measures, but wait until something bad happens, _then_ do something about it.

    17. Re:Waste of helium by Rei · · Score: 5, Informative

      Helium is a rare element on Earth, despite being common in space. We need to be conserving our helium supplies. Why are we wasting helium on stuff like this?

      Sigh, this stuff again....

      1) All lifting uses combined (party balloons, blimps, etc) make up a fraction of the 13% "other" category.. The big wasters are industry, where they buy either gaseous (e.g. welding) or liquid (e.g. cryogenics) and just dump it to the outside air. No recovery effort whatsoever. To the people who run cryogenic / industrial equipment: Yes, I know, recovery systems are a cost and it's always iffy whether it pays for itself. But you, "cryogenic people", and you, "we're running out of helium people", fight amongst yourselves and leave lifting purposes - which use little helium - out of it.

      2) Of that fraction of a 13% dedicated to lifting purposes, blimps use only a small fraction of it.

      3) Modern fabric for blimps such as vectran or aluminized BoPET leak literally several orders of magnitude less than old fabrics like polyurethane-coated nylon.

      4) Old style blimps need regular venting to adjust lift. Part of the purpose of this new generation of hybrid blimps is that they don't have to do that. And it's not the only type that can do this; variable-superpressure blimps can as well, as can phase-change blimps (see project ALICE).

      In short, you're looking at a tiny fraction of a tiny fraction of a small fraction of a fraction of 13% of helium usage. No, this is not a problem. Furthermore, concerning helium itself:

      1) It's not clear that we're anywhere near "running out of helium". Helium hasn't been studied nearly as much as more economically important resources like oil and gas. We really don't even understand why most deposits that are rich in helium are like that. Entire new categories of helium deposits, such as volcanic helium, are looking increasingly likely to be economical (it had previously been thought uneconomical because it would all be diluted with CO2; we're now finding that this isn't always the case). We're finding out that groundwater plays a role in where helium migrates to. And on and on. As helium prices rise, more work is finally getting put until understanding helium resources and finding new ones. It used to be just way too cheap for that.

      2) The absolute worst case for helium is refrigerating it from the atmosphere, as the end stage of what we currently do to separate other noble gases. By volume, neon is about 3,5 times more common than helium, while helium is about 60 times more abundant than xenon; so the volumetric price for helium should be between that of neon and xenon, but closer to neon. Expensive, but still available. Except for one thing...

      3) ... we'll never get to that point. Because any gases from the ground will always be significantly more helium rich than the atmosphere, so we'll always use them as our source. Even if today's helium resources do get depleted (not likely anytime soon, see #1), it just means a steady progression to less helium rich gases (including virtually limitless volcanic ones) as the source. It will never approach the price of gases like neon, even in the worst case.

      Also, from the summary:

      The Airlander, made by British company Hybrid Air Vehicles, has four engines and no internal structure. It maintains its shape thanks to the pressure of the 38,000 cubic meters of helium inside its hull,

      Um, no, it's not. Blimps don't work that way. Loads are distributed at the very least by catenary curtains and cables.

      If you want a small scale example, take a garbage bag, blow air into it, and tie it off (blimps only have a couple hundred pascals overpressure, they're not like party ballons). Now hang a weight from it. Notice how horribly it deforms. You need catenary curtains to distribute the weight of your load across the fabric, to maintain your desired (aerodynamic) shape. You also need ballonets, so that the blimp doesn't explode when you change altitude.

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
    18. Re:Waste of helium by Thud457 · · Score: 1

      I don't know, both the SR-71 and the Concord are pretty sweet.
      I am correct in my understanding that none of those are currently mobile, right?

      --

      the preceding comment is my own and in no way reflects the opinion of the Joint Chiefs of Staff

    19. Re:Waste of helium by michelcolman · · Score: 1

      Why worry about 99.995%? Even at 99%, lift is only 1% less. Make the balloon 1% bigger and go with the cheap stuff to fill it. Or am I missing something?

    20. Re:Waste of helium by michelcolman · · Score: 1

      The biggest problem is that it leaks out of the airship (right through the hull). It will have to be topped up rather regularly. And quite possibly other gases will find their way in, creating the need for purifying the He on a regular basis.

    21. Re:Waste of helium by Rei · · Score: 5, Informative

      An envelope filled with N2 around each hydrogen cell would make a Hindenburg-style explosion pretty much impossible.

      It doesn't work that way. Ignoring the tremendous amount of extra mass you're proposing and the increased cross section, hydrogen does not instantly dilute; by and large it will just rise through the nitrogen to the outside. Furthermore, hydrogen has an incredibly broad flammability range; you only need a couple percent H2 for it to burn.

      Also, because the H2 molecule, being composed of two atoms, is twice as large as the He atom (helium doesn't pair with itself to form molecules), which only has one atom, it will take MUCH longer for the hydrogen to escape through the pores of the gas bag/lifting cell.

      Permeability does not work that way. Permeability is a complex process involving not just porosity but also affinities and solubilities. As a general rule, hydrogen and helium permeabilities are quite similar.

      a volume of hydrogen molecules is still halt the weight of the same volume of helium atoms.

      It's actually not that much of a difference because both are vastly lighter than air (2 vs 4 vs. 29).

      LZ-126/U.S.S. Los Angeles gives a real world example of the difference between operating the same ship with helium versus hydrogen.

      It's not that simple. They didn't just switch lifting gases, they also added an exhaust water recovery system (aka added weight and a bit of extra drag and a bit of parasitic energy consumption). Range of an airship is relative to its drag, its energy efficiency and the amount of fuel it can carry.

      if the Hindenburg had used helium instead of hydrogen,. it would have never got ff the ground.

      They wanted to use helium as the lifting gas, and lobbied the US for permission to import it. They actually designed the airship around the premise that they'd be able to convince the US, and had to redesign it when the US refused. Zeppelin, the world's biggest producer of hydrogen airships, still preferred helium. Hydrogen was out of necessity, not desirability.

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
    22. Re:Waste of helium by Anonymous Coward · · Score: 0

      Naw, we should just start mining from the sun.

    23. Re:Waste of helium by geantvert · · Score: 2

      Hummm... I was under the impression that the lifting power of H2 was only marginally better than He.
      What matters is not the ratio of the mass of H2 with He but their difference with respect to the mass of the surrounding air.

      I do not have the right numbers but let's assume that the mass of 1m3 if gas is 1000g for air, 200g for He and 100g for H2.

      The lifting power of 1m3 of air is 1000-1000 = 0 (by definition)
      The lifting power of 1m3 of He is 1000-200 = 800g
      The lifting power of 1m3 of H2 is 1000-100 = 900g
      The lifting power of 1m3 of pure vacuum is 1000-0 = 1000g (the maximum)

      So we see in that example, that the lifting power of H2 is only 12.5% more that of He even though its weight is half.

    24. Re:Waste of helium by geantvert · · Score: 1

      Wikipedia gives 8% more lifting power for Hydrogen vs Helium so probably not worth the risk of using an explosive gas.
      https://en.wikipedia.org/wiki/...

    25. Re:Waste of helium by BarbaraHudson · · Score: 1

      The envelope would have FAR less volume then the hydrogen cell. Besides, pure nitrogen is also 3% lighter than air, which also has oxygen, which is heavier then nitrogen by about 15%.

      A small quantity of oxygen is absolutely no danger, same as you can throw a match into a full tank of gasoline, or if you throw it into a pool of diesel, it goes out. Can't do that with an almost empty tank because there's enough oxygen to sustain combustion.

      --
      "Transparent" is a shit show that trades on every stereotype going. A man in drag is NOT a transsexual.
    26. Re:Waste of helium by lbmouse · · Score: 1

      Plus if Trump wins the Presidency history would really be repeating itself in a hurry!

    27. Re:Waste of helium by hey! · · Score: 1

      Helium is sold in highly pure form as a side effect of its being transported in liquid form. Since gasses liquefy at different temperatures, preparing He for transport works kind of like fractional distillation. On the user end the remaining impurities are mainly trace atmospheric gasses, which of course are approximately neutrally buoyant.

      However it given the titanic volume of He used in these things, it might more economical to fill them or top them off near the natural gas fields we get He from. In that case the He would be much less pure, but the main contaminant would be methane, which is also lighter than air. This less pure gas would not work as well as the the very pure He that is normally marketed, but given this is a hybrid airship the net result would only be a slightly lower payload.

      So it's physically feasible to use relatively impure He, but whether it makes economic sense depends on whether the savings offset the reduced cargo payload revenue and costs of sourcing the He specially.

      --
      Post may contain irony: discontinue use if experiencing mood swings, nausea or elevated blood pressure.
    28. Re:Waste of helium by Rei · · Score: 1

      Oh, one more thing I forgot to mention with your N2 idea. It's the same problem that hydrogen airship ballonets suffered: hydrogen will permeate through its cells and accumulate in the "N2" space. And again, remember that it only takes a couple percent H2 to burn with air (it's surprisingly tolerant of oxygen depletion, too.... hydrogen just loves to burn, and burn aggressively :)

      Making all matters worse is that airships tend to be somewhat like lightning rods. Even a tiny, imperceptible discharge can ignite hydrogen (its ignition energy is only a tenth that of gasoline vapour). The problem is that both hydrogen and helium have lower electric breakdown voltages than air (helium more than hydrogen, but the problem affects them both). Hence, electricity flowing through the airship is an easier path to ground than through air. Today's helium blimps are generally only allowed to be flown in clear-weather conditions, where the risk of lightning is thought to be effectively zero. Yet it's still very common for them to develop lightning pinholes on their surface from minor strikes, where the lightning burned away the fabric. Hindenburg's metal frame helped with electrical discharges, but clearly not enough.

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
    29. Re:Waste of helium by BarbaraHudson · · Score: 1

      You seem to forget that the nitrogen envelope weighs less than the equivalent volume filled with air. 3% less by volume, because nitrogen weighs 15% less than oxygen. There is no weight penalty for the envelope, since nitrogen is a weak lifting gas. Also, all things considered, hydrogen still has an 8% to 12% lift advantage to helium. 8% can be the difference between profit and loss for a business. link

      The economic case for hydrogen is much better. Hydrogen doesn't need to be transported - it can and is generated anywhere you have water and electricity, as needed. Given that it's cheaper and a better lifting gas, if we are thinking of using it in compressed form in road vehicles operated by the average Joe, we can certainly use it in uncompressed form in airships operated by specialized crew.

      --
      "Transparent" is a shit show that trades on every stereotype going. A man in drag is NOT a transsexual.
    30. Re:Waste of helium by clubby · · Score: 1

      Except that we're running out of helium, can't make more, and we need it for things like MRI machines. Considering that we already use highly combustable jet fuel in aircraft, I'm not sure the risk to passengers of using hydrogen outweighs the risk to modern medicine by running out of helium.

    31. Re:Waste of helium by BarbaraHudson · · Score: 1

      Since you can't use either on in absolute pure form, it's generally 8% to 12% (i've posted links elsewhere) in practice. Even 8% is a huge difference in performance when you are looking at moving cargo by air. 8% more capacity is the difference between profit and bankruptcy for airlines. That's why they keep packing more people like sardines.

      The nitrogen envelope doesn't just contribute to safety - it's also a slight lifting gas (3%), so adding it imposes no weight penalty.

      We use explosive gases all the time. There's no reason, given both the much better economics of hydrogen supply vs helium supply, that we can't find ways to mitigate the risks. Also, you won't get an explosion in an airship filled with hydrogen. It will burn only where the gas is in contact with oxygen - in other words, outside air. Watch the Hindenburg - it didn't explode, even though the outer skin was covered with an unstable, highly flammable coating that was susceptible to static buildup via friction with air. Without this, the Hindenburg would not have burned - any loss of hydrogen would have simply escaped through vents. It was the continuous burning of the fabric that ignited the hydrogen. Without an ignition source, nothing would have happened.

      --
      "Transparent" is a shit show that trades on every stereotype going. A man in drag is NOT a transsexual.
    32. Re:Waste of helium by Suomi-Poika · · Score: 2

      What is this "tremendous amount of extra mass" you are referring to? If we take Hindenburg(not -berg you millennials!) as an example, the solution, and the idea, would be just to replace gas contents of the space between hydrogen cells and the airship outer shell.

      This is not increasing mass a lot since the only thing needed is to have a airtight and controlled outer shell where the pressure can be adjusted. Splitting the sections and adding pressure monitoring system would detect the outer shell ruptures immediately, adding time to react and repair damages if possible.

      All this does not make the airship fire or accident proof but it would add one very good feature: a spark or a hot spot of heat inside the outer cell would not ignite the hydrogen cells, specially if instead of nitrogen we use helium as the "insulator" gas. Then there is no oxygen for any kind of fire. Any total puncture would result a hydrogen+helium leak. I don't know how they dilute but my guess is probably better than hydrogen and nitrogen.

      Point here is that making the hydrogen relatively safe as a lifting gas it would make safe enough autonomous airships. Those can be used for transporting cargo and other tasks which do not need any personnel on board.

      Of course it is possible just use hydrogen only and take all of the risks at once... but still I'd estimate that cargo shippers would like high payload and added safety.

    33. Re:Waste of helium by nojayuk · · Score: 1

      this is a portable aircraft with a good carry capacity.

      The new version of the Russian Mi-26 heavy-lift helicopter can, reportedly, lift 25 tonnes, significantly more than the Airlander. Existing models of the Mi-26 can carry 20 tonnes of cargo, land on large ships, don't need lots of prepared ground to operate from etc. There's talk of an evolutionary new version to be developed jointly by Russia and China which would be able to lift 33 tonnes but it's still on the drawing board.

      The Airlander folks have glossy brochures extolling later development versions of their airship which reputedly would be able to carry up to 60 tonnes of cargo but it's taken them all this time to get their first prototype into the air. I wouldn't hold my breath waiting for that larger version to make its first flight.

    34. Re:Waste of helium by Rei · · Score: 1

      You seem to forget that the nitrogen envelope weighs less than the equivalent volume filled with air.

      I'm not talking about the mass of the nitrogen. I'm talking about the mass (and cost) of having an entire extra envelope.

      The economic case for hydrogen is much better.

      So's the economic case for shutting down your city's fire department.

      Until a fire happens. Which it invariably will, when you're dealing with a gas that burns in almost any fuel-air mixture, needs only a tiny ignition energy, and is the "easy route" for electrical discharges through the air or between the ground and the air.

      if we are thinking of using it in compressed form in road vehicles operated by the average Joe

      1) That's stupid also (for lots of reasons, not just safety)
      2) FCV hydrogen is contained within extremely strong carbon fiber tanks and is the difficult route for electricity to flow, as well as being difficult to permeate through; airships are just the opposite.
      3) A FCV contains about 4 kg of hydrogen (when full). A large airship contains at least 1000 times as much. The Hindenburg carried nearly 17 tonnes.

      I could also present some of the further arguments in favor of FCV safety by their proponents, but I personally don't agree with them, so I'll let someone else be their defender.

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
    35. Re:Waste of helium by bigpat · · Score: 1

      Now that is a convincing argument.... bottom line is to go ahead and use as much helium as is economically viable and don't worry about imposing balloon bans or silly restrictions.

    36. Re:Waste of helium by Rei · · Score: 1

      See the post above yours. The extra mass is the mass of an entire extra envelope.

      a spark or a hot spot of heat inside the outer cell would not ignite the hydrogen cells

      In reality, hydrogen diffuses across membranes and pools in adjacent spaces. Aka, you won't have a nitrogen space, but a nitrogen-hydrogen space, adjacent to the outside air. To make matters worse, the hydrogen in the nitrogen space tends to pool at the top. Furthermore, any electrical discharge will burn through both the inner and outer envelopes, not just one or the other.

      specially if instead of nitrogen we use helium as the "insulator" gas. Then there is no oxygen for any kind of fire.

      Huh...?

      Point here is that making the hydrogen relatively safe as a lifting gas...

      Funny how pretty much the entire industry disagrees with you. Even Zeppelin, who never wanted to have to make the Hindenburg a hydrogen airship in the first place, but was forced to.

      Seriously, you think that nobody has ever thought of the idea of a dual envelope before? Do you really think that it's being seen for the first time here on Slashdot, posted by people who've never worked with airships? I swear, pretty much every armchair airship builder proposes this concept.

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
    37. Re:Waste of helium by amicusNYCL · · Score: 1

      You sound like you know something, what are you doing on Slashdot?

      How does this airship stay on the ground? In the videos I've seen it doesn't look like there are any cables, does it have a way of adjusting lift or do they try to make it more or less neutrally bouyant?

      --
      "Our two-party system is like a bowl of shit looking at itself in a mirror." - Lewis Black
    38. Re:Waste of helium by serviscope_minor · · Score: 1

      Um, no, it's not. Blimps don't work that way. Loads are distributed at the very least by catenary curtains and cables.

      The outer envelope does that job on smaller ones. Here's some pictures:

      http://www.anabatic.aero/

      No cables inside or curtain inside. I worked on a project with one of the blimps back when the company was called minizepp, and we had an 8m long version. The construction had an impermeable bag on the insid and a ripstop nylon outer. Th gondala is velcro'd and then tied with ropes to the envelope.

      I think minizepp's flagship model was a 20m behemoth of a similar design.

      Anyway, either way, the pressure is what maintains the shape since there's no rigid structure in a blimp.

      --
      SJW n. One who posts facts.
    39. Re:Waste of helium by Anonymous Coward · · Score: 0

      See, that's the magic of this market economy thing. When hydrogen availability goes down, cost will go up.

      By the way, we're "burning" millions of cubic feet of helium an air that's not economically extractable from natural gas. PSA uses energy, which costs money, and at this point, costs more than the value of helium.

    40. Re:Waste of helium by Rei · · Score: 1

      First off, typo on your specs page that you might want to fix (Lenght -> Length) :)

      What's your internal pressure? The higher the internal pressure, the less the deformation without internal reinforcement, and the smaller the envelope, the easier it is to bear a higher pressure. You often see superpressure balloons at small scale, but rarely at the large scale. I'm betting no ballonets either? Superpressure balloons have a degree of inherent altitude maintenance by resisting volume change (you'll note that I did mention them in point #4 in the first section).

      Remember that large airships have very small differences between internal and external pressure, in order to minimize stresses on the envelope. Internal pressure is kept only high enough to resist deformation under wind loads, usually 300-500 pascals (3-5mb, ~0,04-0,07psi). By contrast, a party balloon is more like 7000 pascals.

      Another issue that will affect you is that the ratio of your envelope to payload will be significantly higher on the small scale - and thus the effect of payload deformation correspondingly diminished.

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
    41. Re:Waste of helium by Anonymous Coward · · Score: 0

      The AirLander uses the helium for part of its lift. The blimp shape is an aero-dynamic lifting body, so as flies along the body generates the extra lift needed.

    42. Re:Waste of helium by serviscope_minor · · Score: 1

      First off, typo on your specs page that you might want to fix (Lenght -> Length) :)

      Nice try, but no. I was a happy customer of http://minizepp.com/ who went out of business or sold to those guys. The minizepp guy (it was one guy) basically adored blimps and made these wonderful ones. I think like many people in his position, business considerations were limited to "the bare minimum I need to continue making blimps", which is sadly not terribly sustainable.

      What's your internal pressure?

      Pass! I mean I literally don't know: we didn't measure it. It was always pressurised by feel, so that the skin was nice and tight and the payload and gondola didn't flop around. Kind of gave a low, satisfying "pling" if you flicked it.

      I'm betting no ballonets either? Superpressure balloons have a degree of inherent altitude maintenance by resisting volume change (you'll note that I did mention them in point #4 in the first section).

      It had one internal ballonet for adjusting the overall pressure with air for tensioning it, since the required mass of gas inside changes with temperature and atmospheric pressure daily. Generally it needed setting up at the beginning of each run where you pressurised it with the ballonet, then ballasted it to make it sink. The ballonet was then deflated for storage. There was no automatic control over the ballonet, but given R/C requirements, you couldn't go too far above ground level anyway.

      Remember that large airships have very small differences between internal and external pressure, in order to minimize stresses on the envelope. Internal pressure is kept only high enough to resist deformation under wind loads, usually 300-500 pascals (3-5mb, ~0,04-0,07psi). By contrast, a party balloon is more like 7000 pascals.

      The pressure of the one I had was sufficient to maintain shape (it could hit 50kmh---an impressive sight to be sure!) under wind loads and to not deform too much under maximum thrust from the force imparted via the gondola. Definitely much less tension than a party balloon. Bear in mind on a device of this scale, the skin serves the same function as a curtain: it's thick ripstop Nylon, so it spreads out any load somewhat evenly.

      Obviously the larger they are, the worse it gets using internal pressure which is why the largest, fastest ones previously used a rigid structure.

      Another issue that will affect you is that the ratio of your envelope to payload will be significantly higher on the small scale - and thus the effect of payload deformation correspondingly diminished

      True. Based on memory. The 8m blimp had payload of roughly about 3kg at 2000m, excluding the gondola, which was quite a few more (mostly lipo batteries!), plus we generally had to ballast it. The envelope and gas bag were a relatively small fraction of the overall weight.

      --
      SJW n. One who posts facts.
    43. Re:Waste of helium by Rei · · Score: 1

      The leakage rate through vectran is a couple orders of magnitude less than through PU-coated nylon. Liquid crystal polymers are neat that way :)

      Also, since it doesn't need to vent to descend, you don't lose helium that way either.

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
    44. Re: Waste of helium by Rei · · Score: 1

      Because if you access helium without reserving it first then you get a segfault.

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
    45. Re:Waste of helium by Rei · · Score: 1

      Airlander's range when fully loaded is 2 1/2 times that of the Mi-26 in ferry configuration. That's more than a little bit of a difference. Airlander can hover in place for long periods (for example, skycrane-style applications); Mi-26 can't. Airlander can land in water, boggy ground, highly uneven surfaces, and other challenging environments; Mi-26 can't. I imagine its maintenance costs are quite a bit lower as well, running just a few small fans (combined with 1/10th the power output of a standard Mi-26) that aren't life-or-death if they fail (it can lose three of the four and still fly). Now, obviously an airship has a lot of costs that a helicopter doesn't. And Mi-26 can fly twice as fast. But they're not trying to drive helicopters out of the market, they're trying to fill in niche applications that helicopters are poorly suited for.

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
    46. Re:Waste of helium by RockDoctor · · Score: 1

      would be just to replace gas contents of the space between hydrogen cells and the airship outer shell.

      If the airship is powered by IC engines, would the engine's exhaust be sufficiently low in oxygen to provide a non-flammable envelope around the lifting gas bags, for effectively free. Then it wouldn't really matter if there were minor leaks in the outer envelope. If the exhaust gases also heated the lifting gas appreciably, you might get noticeable lift from a "hot air" effect too.

      Just flying a kite here.

      --
      Birds are not dinosaur descendants;birds are dinosaurs, for all useful meanings of "birds", "are" and "dinosaurs"
    47. Re:Waste of helium by BarbaraHudson · · Score: 1

      An extra, non-structural envelope (it doesn't actually lift the craft, unlike the inner bladder/cell/gasbag) can weigh a lot less. It only has to support it's own weight.

      Alternatively, there's no reason not to fill the entire interior that contains the lifting cells with nitrogen. Anyone needing to access the interior can do the same as farmers on pig farms do when going into the sludge pits or firemen in burning buildings - Self Contained Breathing Apparatus..

      Hydrogen does NOT "explode" when it leaks from a dirigible.

      The Hindenburg would not have burned the way it did except for the coating that they applied to the exterior fabric, which turned out to be chemically unstable and subject to static buildup. A flame-retardant fabric would have not allowed the spread of any fire as quickly, and if the interior had been filled with N2 there would have been no fire.

      --
      "Transparent" is a shit show that trades on every stereotype going. A man in drag is NOT a transsexual.
  3. Manned versus unmanned. by MenThal · · Score: 2

    If it can carry tons of cargo, why the huge difference in time for manned (5 days) and unmanned (2 weeks)? ... Is it perhaps the size of the portapotty needed for the bricks people on that thing will lay during the voyage?

    1. Re:Manned versus unmanned. by tomhath · · Score: 2

      Same as manned spaceflight versus unmanned. To support people you need living spaces, food, water, heat/AC, pressurized cabin, etc. Lots of extra weight and energy consumption.

    2. Re: Manned versus unmanned. by MenThal · · Score: 1

      But space can't take tons of cargo, so I don't see which way the math turns into 3x.

      If it was filled with passengers, then it would add up, but just crew?

    3. Re: Manned versus unmanned. by Anonymous Coward · · Score: 0

      A person requires some space, food, bedding heating etc etc. So would be taking several tons of space alone just for living, then it would come down to how much air, water and fuel they are carrying. It also didn't say it can stay airport for 2 weeks while fully loaded, just while unmanned.

    4. Re:Manned versus unmanned. by Anonymous Coward · · Score: 0

      Some of the promo shots show it carrying cargo slung under the belly like a Chinook would carry it, so I guess a lot of that capacity isn't accessibly by the crew in-flight.

    5. Re:Manned versus unmanned. by dbIII · · Score: 4, Informative

      Same as manned spaceflight - the glory days have gone.
      This is 300 foot long. The Graf Zeppelin of 1928 was 776 feet long with a useful lift of 60 tonnes.
      The Hindenberg was even bigger.

    6. Re:Manned versus unmanned. by PolygamousRanchKid+ · · Score: 1

      Obviously, with unmanned, you don't need to worry about pilot unions and strikes.

      --
      Schroedinger's Brexit: The UK is both in and out of the EU at the same time!
    7. Re:Manned versus unmanned. by Anonymous Coward · · Score: 0

      "the glory days have gone."

      AKA maturity. When I was a kid I wanted to be a flying firefighting gorilla. Those glory days are gone too.

    8. Re:Manned versus unmanned. by JaredOfEuropa · · Score: 1

      And, believe it or not, the Hindenberg had a smoking room. Now that's asking for trouble!

      --
      If construction was anything like programming, an incorrectly fitted lock would bring down the entire building...
    9. Re:Manned versus unmanned. by dj245 · · Score: 1

      Same as manned spaceflight - the glory days have gone. This is 300 foot long. The Graf Zeppelin of 1928 was 776 feet long with a useful lift of 60 tonnes. The Hindenberg was even bigger.

      Material science and strength calculation complexity was a lot less advanced in the 1920s. You could build a better airship today if you wanted to, but it probably wouldn't make sense. Cargo airplanes are likely more cost efficient. Fuel-wise, the airship might be favorable, but the financial impact of an expensive asset taking 3 days to travel 6,000 miles vs 12 hours for a plane is a large consideration. The 747-ERF freighter can carry 248,600 lb (112,760 kg), nearly double the Graf Zepplin. And it can do 3 round trips of 6,000 miles in the time that it would take the Graf Zepplin to do a single 1-way trip. It's not easy to think of a market nowadays where airships would make sense.

      --
      Even those who arrange and design shrubberies are under considerable economic stress at this period in history.
    10. Re:Manned versus unmanned. by Shoten · · Score: 4, Interesting

      Same as manned spaceflight - the glory days have gone.
      This is 300 foot long. The Graf Zeppelin of 1928 was 776 feet long with a useful lift of 60 tonnes.
      The Hindenberg was even bigger.

      As soon as I saw the picture of it, that's exactly what went through my mind as well. They claim in the write-up that they're some kind of revolutionary fusion of different technologies...it's just a modern blimp with turbofans for thrust and some fins for directional/pitch control. Nothing new to see here, and not even very big when compared to craft of similar nature.

      Even more importantly, it's a solution in search of a problem. They originally built it for the military...which means "we thought they'd buy it from us, but they just laughed so we need someone else to give us money now." Note the prominent "Invest in Us" button at lower right.

      Also, 10 tons of cargo is NOT a lot of capacity for something of this size. That's 20,000 pounds...while a C-17 can carry 169,000 pounds. A lot of that cargo capacity will be consumed by holding crew and the things needed to support them, as well.

      So...in short, what you have is an airship that cannot be parked outside (you would not believe what wind will do to something this big but this light), that cannot go very fast, that cannot carry very much, that probably (given the pervasive use of carbon composites and Vectran in its construction) costs a shit-ton of money to build and repair, and that is made by a company that probably won't be in business much longer. Waaaaaaa hoo.

      --

      For your security, this post has been encrypted with ROT-13, twice.
    11. Re:Manned versus unmanned. by Anonymous Coward · · Score: 0

      And, believe it or not, the Hindenberg had a smoking room. Now that's asking for trouble!

      No, that's comfort. You know, flying in style? Eating, drinking, dancing, smoking, fucking. Just the things you can't do in airplanes these days. OK, except for fucking.

    12. Re:Manned versus unmanned. by plover · · Score: 1

      Right now, people are willing to wait weeks for a cargo ship to cross the ocean; those ships hold thousands of containers. But the expensive assets are unavailable during the journey. If you need them faster, your only choice is to load them on a plane, and you can have them in a day. But what about the middle ground? Is there no market for cargo that needs to arrive in three days instead of three weeks, at one tenth the price of air freight? I'm thinking that half of Amazon purchases could be shipped directly from China and arrive in four or five days, which would probably still be acceptable for most purchases. When you consider the volume Amazon ships, that's a lot of freight.

      So I wouldn't discount this as a useless exercise, at least not yet. People are surprisingly clever at coming up with creative uses for all kinds of technical novelties.

      --
      John
    13. Re:Manned versus unmanned. by RKThoadan · · Score: 1

      Previous articles I've read on airships have typically focused on their ability to operate without an airport, or even a simple airstrip. They can pickup and transport large, heavy equipment directly to where it's needed regardless of most terrain. It seems like a nice capability, but I don't know what the market for that really is.

    14. Re:Manned versus unmanned. by iris-n · · Score: 1

      I spoke once to a engineer that built motors for ships. His problem was that the motors were just too big to be transported from where he was (Bavaria) to where the ships were being built (Hamburg). They just didn't fit in the roads between these two places. So he had to build only the "small" motors (four meters high, ten meters long), while the really big stuff was built in China and shipped by ship (or just used for ships built also in China).

      This Zeppelin would be the perfect solution for him. The carrying capacity is still too low (10 tons), as the big motors weight on the order of 100 tons, but I don't see any difficulty in scaling this up.

      --
      entropy happens
    15. Re:Manned versus unmanned. by Thud457 · · Score: 1

      That's just good design.
      They knew people were going to smoke, so they gave them a designated area where it was safe to do so.
      Much smarter than posting signs all over the place saying "ACHTUNG RAUCHEN IST VERBOTEN" all over the craft and then going up in flames five minutes after departure.

      --

      the preceding comment is my own and in no way reflects the opinion of the Joint Chiefs of Staff

    16. Re:Manned versus unmanned. by Anonymous Coward · · Score: 0

      No it hadn't. The Hindenberg never existed in real life. It's a 100% product of ignoramuses. The Hindenburg on the other hand, did exist.

    17. Re:Manned versus unmanned. by Anonymous Coward · · Score: 0

      Soooo. How much does a C-17 cost? How much does it cost to fuel it? How much does it cost to maintain?

      Stupid ass kid. Go home.

    18. Re:Manned versus unmanned. by dbIII · · Score: 1

      Well yes, but how much fuel will it use?

    19. Re:Manned versus unmanned. by dbIII · · Score: 1

      Material science and strength calculation complexity was a lot less advanced in the 1920s

      Not as much as you would think.
      Those same age-hardened aluminium alloys are in use in aircraft today and solid mechanics calculations haven't really changed since then, we can just do it a lot of calculations a lot quicker with computers. Techniques like finite element analysis are about applying those same old calculations to much simpler geometries to do a vast number of simple operations instead of a few difficult ones.

    20. Re:Manned versus unmanned. by Anonymous Coward · · Score: 0

      you would not believe what wind will do to something this big but this light

      I keep clicking the clickbait headline but there's no article coming up! What's up with that?

    21. Re:Manned versus unmanned. by samwichse · · Score: 1

      It is very different, IMHO.

      The Zeppelins were rigid, true lighter than air craft with bladders used to control buoyancy and maneuvering engines.

      This is a heavier than air craft with no bladders, only using aerodynamic lift like an airplane. And it doesn't have a rigid envelope.

      Basically "flies like a plane" vs "flies like a blimp" is the big difference and what makes this a hybrid airship. It should also make this thing MUCH easier to handle.

      Sam

  4. Helicopters by Anonymous Coward · · Score: 1

    This is not a helicopter (rotary winged aircraft) in any sense. For a technically oriented site this is appalling.

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

      Who said it was a helicopter?

    2. Re:Helicopters by LesFerg · · Score: 1

      Who said it was a helicopter?

      The summary right there at the top of the the page said it.

      Part airship, part helicopter, part plane, the 300-foot long aircraft is about 50 feet longer than the world's biggest passenger planes.

      --
      If I had a DeLorean... I would probably only drive it from time to time.
    3. Re:Helicopters by Big+Hairy+Ian · · Score: 1
      FTFA

      Part airship, part helicopter, part plane

      --

      Build a Man a Fire, and He'll Be Warm for a Day. Set a Man on Fire, and He'll Be Warm for the Rest of His Life.

    4. Re: Helicopters by Anonymous Coward · · Score: 0

      Well, this is just a modern airship, not part helo or any of the other click bait crap. The rotors are used in the same way as old ships as far as I can see, for propulsion. A helicopter on the other hand is lifted by the rotor itself.

    5. Re:Helicopters by Anonymous Coward · · Score: 3, Informative

      Fair point, Is suspect someone got confused by the statement:

      "The largest aircraft currently flying uses innovative technology to combine the best characteristics of fixed wing aircraft and helicopters with lighter-than-air technology to create a new breed of hyper-efficient aircraft."

      and thought that "best characteristics of ... helicopters" meant it's part helicopter, rather than it has some of the abilities of one (i.e. sustained hovering over a location). That's what you get when people don't understand English I guess.

    6. Re: Helicopters by Blaskowicz · · Score: 1

      But in the pictures and video we can see the front rotors can swivel and point up or half way up. They might be used to move up and down in some fashion.

    7. Re:Helicopters by Anonymous Coward · · Score: 0

      Thank you, Big Hairy Ian, users of Slashdot dot org. I'm here to educate you about the single biggest threat to our planet. You see, there is something out there which threatens our very existence and may be the end of the human race as we know it. I'm talking of course about... PlaneHeliBlimp. It is a construct which roams the earth's skies alone. It is half airplane, half helicopter, and half airship. Some people say that PlaneHeliBlimp isn't real. Well, I'm here to tell you know, PlaneHeliBlimp is very real, and it most certainly exists. I'm serial. PlaneHeliBlimp doesn't care who you are or what you've done. PlaneHeliBlimp simply wants to get you! I'm super-serial. But have no fear, because I am here to save you! And someday, when the world is rid of PlaneHeliBlimp, everyone will say "Thank you, Anonymous Coward. You're super awesome." The end.

    8. Re: Helicopters by Clsid · · Score: 1

      But the lift is not generated by the rotor. That is a big difference.

  5. Cargolifter lives! by Anonymous Coward · · Score: 0

    Tropical Islands Resort (Follow the link if you don't see the connection.)

  6. I thought Helium was a scarce resource by thatjavaguy · · Score: 1

    Pretty sure I read that Helium was a precious commodity.
    Do we really want a fleet of these things?

    1. Re:I thought Helium was a scarce resource by Anonymous Coward · · Score: 2, Informative

      There is lots of Helium. It is a by product of oil and gas extraction and a huge amount was discovered recently in Africa.

    2. Re: I thought Helium was a scarce resource by Anonymous Coward · · Score: 0

      Fun fact: most of the helium in the world comes out of oil or natural gas wells and is then pretty much vented straight to atmosphere. There is no cost effective way to process and store it all, and there is not enough demand to justify it anyway, even if there were. A fleet of these aircraft would still amount to a mouse-fart of helium in the grand scale.

    3. Re:I thought Helium was a scarce resource by Anonymous Coward · · Score: 0

      Then we need to address the bigger wasters of party balloons and MRI machines.

    4. Re:I thought Helium was a scarce resource by Anonymous Coward · · Score: 0

      What makes you think Africa will sell it to other countries... It's their, they can use it to whatever purpose they want. They can burn it if they want..

  7. It's tiny compared to airships of the past by ribuck · · Score: 4, Informative

    Airships of the past were much bigger. The Hindenberg was 803 feet long (245 meters), more than twice the length of this midget.

    1. Re:It's tiny compared to airships of the past by Anonymous Coward · · Score: 0

      So the Airlander is the worlds largest currently active airship but not of all time.

    2. Re:It's tiny compared to airships of the past by Anonymous Coward · · Score: 0

      But this is a heavy-than-air airship, so it relies on both helium and aerodynamic lift to fly, unlike the Hindenberg.

    3. Re:It's tiny compared to airships of the past by Mouldy · · Score: 1

      Cardington Hangars is where Britain used to make airships in the past. The R101 was the biggest at 777ft.

      More recently, the hangars have been used for various film sets including Batman and Star Wars.

    4. Re:It's tiny compared to airships of the past by WallyL · · Score: 1

      Imma let you finish, but the Hindenburg had the largest volume of all time?

    5. Re:It's tiny compared to airships of the past by istartedi · · Score: 1

      My Dad grew up in New Jersey. He said when the Hindenberg flew by, the teacher let them look out the window. Even though it was miles away they could clearly see it I guess. The Washington Monument is a mere 555 feet tall. The Empire State Building is 1250, not including the spire. So try to imagine more than the WM, and more than half the ES floating by low on the horizon, perhaps with the swastika visible. The implications weren't fully understood yet--a few years later my Dad and all his brothers were off to war.

      --
      For all intensive purposes, "whom" is no longer a word. That begs the question, "who cares"?
  8. Did anyone else look at this and think by Anonymous Coward · · Score: 0, Insightful

    Anyone else look at the first picture of this thing on the Hyrbid air vehicles site and think "Yeah.. I'd hit that". Check the first link, first picture and see for yourself.

    1. Re:Did anyone else look at this and think by Deadstick · · Score: 1

      Yes, most everybody. The Brits are calling it the Big Bum.

    2. Re:Did anyone else look at this and think by Anonymous Coward · · Score: 0

      Looked to me at first like a giant nut-sack, like, from underneath.
      Head-on, I see booty fillin' really tight pants.

  9. Why Not Hydrogen? by Anonymous Coward · · Score: 1

    Hydrogen is cheaper and more abundant, but because of one minor setback 80 years ago the idea has been senselessly abandoned. Imagine the same principle was applied to other aircraft and we abandoned the whole idea as soon as one thing went wrong. There certainty wouldn't be any aeroplanes or helicopters now. Bizarrely, people consider it normal when an aeroplane crashes and kills hundreds of people, and it's not a problem even when it happens multiple tiles per year, but when there's on incident with a hydrogen airship in which only 35 of the died (out of 127 on board) plus two on the ground, that's apparently cause to give up entirely.

    Engineering and design methods have improved considerably in 80 years, and we could now likely make a very safe hydrogen airship, but people have an unfounded fear of the idea. Their fear is based on the fact that hydrogen is flammable, yet they have no problems getting on an aeroplane when the wings are full of jet fuel. In this way hydrogen airships are a lot like nuclear power - some people have a totally irrational fear of them.

    1. Re:Why Not Hydrogen? by Anonymous Coward · · Score: 1

      Because Hydrogen is smaller and more leaky...

    2. Re:Why Not Hydrogen? by Anonymous Coward · · Score: 0

      Give it a rest. Using Hydrogen is just asking for trouble.
      It was ill-conceived in the first place. Due to the valence, Helium is inert, Hydrogen is extremely flammable.

      Then again, why am I answering trolls.

      Captcha: eunuch ...

    3. Re: Why Not Hydrogen? by Anonymous Coward · · Score: 0

      No. Hydrogen forms h2, a larger molecule with a lower weight. It actually leaks more slowly than helium.

    4. Re:Why Not Hydrogen? by Blaskowicz · · Score: 1

      A quick check gives a list of disasters, the last ones before Hindenburg I copy-pasted. They feel pretty horrible. Dumb shit happens.

      http://www.airships.net/hydrog...

      Roma (February 21, 1922)

      The United States Army airship Roma (built by Umberto Nobile) ignited when it hit high-tension electrical wires near Langley Field at Hampton Roads, Virginia, killing 34 of the ship’s 45 crew members. After the Roma disaster the United States government decided never again to inflate an airship with hydrogen.

      Dixmude (December 21, 1923)

      The French-operated Dixmude was destroyed over the Mediterranean Sea near the coast of Sicily by a hydrogen explosion visible from miles away. Dixmude’s gas cells had apparently been contaminated with air, creating an explosive mixture, and the ship may have been lifted by updrafts in a thunderstorm, causing hydrogen to be vented and then ignited by the electrically charged atmosphere.

      R101 (October 5, 1930)

      The poorly-designed British R101 lost altitude and sank into a hillside near Beauvais, France. The impact was slight and caused few if any injuries, but the ship’s hydrogen ignited and the ensuing inferno killed 48 of the 55 passengers and crew.

    5. Re: Why Not Hydrogen? by Anonymous Coward · · Score: 1

      No, the problem was that the Hindenburg disaster happened right after the Macon disaster and the Akron disaster which happened after the Shenandoah disaster. There was a LONG LINE of airship disasters.
      All of this at a time when airplanes were being slowly safer and much faster. I agree with your basic point, but we have to be realistic about why those choices were made.

    6. Re:Why Not Hydrogen? by Anonymous Coward · · Score: 0

      I totally agree that modern engineering could make a hydrogen ship safe.

      But Helium is relatively cheap, and you'd need to engineer the safety into the hydrogen. Helium is already non-flammable.

      According to: http://minerals.usgs.gov/minerals/pubs/commodity/helium/mcs-2014-heliu.pdf Helium is only about $3 per cubic meter. The linked article says they use about 38,000 cubic meters of helium for the ship.

      That's only $114,000 for the helium. According to http://www.bloomberg.com/news/videos/b/3a3b8c8a-7b1c-4e69-9c5b-7df10fc11059 the airship cost 40 million dollars. So the lifting gas costs are incredibly small compared to the total costs.

    7. Re: Why Not Hydrogen? by Anonymous Coward · · Score: 0

      Materials (carbon fiber, spectra, etc) and design (CAD, stress analysis, etc) have come a LONG way since the early airships. As well as the fact that most modern "airships" aren't being designed as lighter than air craft (neutrally/positively buoyant) they are designed to be somewhat on the heavy side (negatively buoyant) which means they can create more robust structures and are somewhat less susceptible to wind loading. No doubt they will still have drawbacks (especially wind/storm related) but there are also some significant disadvantages to an aircraft that relies on wings for all of their lift as well (ice buildup, stall, etc).

    8. Re:Why Not Hydrogen? by Anonymous Coward · · Score: 0

      Have you sat down and searched for a comparable or worse number of horror stories involving fixed wing aircraft?

      If you do, would you mind looking at the dates, and compare them too? I bet you, if you built passenger planes with technology from the same time-period, which could take a comparable number of passengers, the numbers wouldn't be pretty either. Especially if at least one type was "ill designed" from the get-go.

      Selection bias is a thing. Don't compare technology from 1920 with stuff that is almost a century newer, or even the planes that benefited from intense research and development during two world wars, which was what it took for modern passenger aircraft to take form.

  10. International Units please by Anonymous Coward · · Score: 3, Insightful

    when will US posters finally stop using imperial manner and units when posting, translating foreign information into their own old-fashionned sick measurment units ? is it a flying ship or a myriapod ? (300 feets ... !! )

    1. Re:International Units please by grumpy-cowboy · · Score: 1

      I'm from QC, Canada and I (we) have no problem at all with Imperial Units.We use both standards in our day to day life. Person weight/height in pounds/feet&inches, distances in KM, construction material in feet/inches (everything is sold in feet : 2x4x10, 4x4x12, ...), ... In school we learned the International System but in real life, this is not what is used (like many things you learn at school not applicable in real life!). :)

      --
      Will $CURRENT_YEAR be the year of the Linux Desktop?
    2. Re:International Units please by dfghjk · · Score: 2

      Never, and people who complain about it are hypocrites. It's not incumbent on others to deal with your inconveniences.

    3. Re:International Units please by GLMDesigns · · Score: 2

      either that or you can become familiar with other units.

      There is something nicely retro in knowing that an acre was a measure of how much land an ox and a farmer could plow in one day; that the plowed in a straight line for 1/8 of a mile (a furlong). Even knowing that a mile was the measure of a 1000 paces (a pace is two steps- left, right).

      You want to be objective? Then I suppose you want us to use Kelvin for temperature? Ah, isn't this a nice 300 degree day?

      --
      If you're scared of your govt then you need to further restrict its powers
      Vote 3rd Party in 2016 and beyond
    4. Re:International Units please by quenda · · Score: 2

      when will US posters finally stop using imperial manner and units

      Right after they start using coins bigger than a quarter-dollar, implement universal health-care, give their streets names, stop believing in God, replace grid-iron with soccer, and drive on left.

    5. Re:International Units please by Anonymous Coward · · Score: 0

      It's funny how Europeans make fun of Americans for not learning other languages, but then turn around and mock Americans for translating units of measurement. Hypocrite much?

      This sort of European is the worst. They're bigots that pretend they're not bigots, and then tell you you're a terrible person for calling them out on their bullshit.

      Also, Kelvin is dumb. Use Rankine. It has better integral precision.

    6. Re:International Units please by Anonymous Coward · · Score: 0

      You want to be objective? Then I suppose you want us to use Kelvin for temperature? Ah, isn't this a nice 300 degree day?

      Rankine, 540 degrees is warm, but comfortable with breeze or shade.

    7. Re:International Units please by Anonymous Coward · · Score: 0

      Coins suck.

      We have ACA, and it's failing.

      Our streets have names. Dumb names, but names nonetheless. And addresses actually make sense here.

      Belief in God is a personal choice, not a governmental one. Anyone that wants to enforce otherwise had better be well-armed.

      Really? Football? You're going to argue over this, even though you're wrong? Rugby and "Association" (a.k.a. Soccer) are both types of football. NFL-style football is a variation of Rugby. Get over it.

      Drive-on-left is a British Empire thing. Continental Europe is mostly sane and drives on the right, just like the US. If you're going to laugh at the US as one of the last remaining countries to officially use imperial units, then you're a hypocrite if you don't laugh at Commonwealth countries (and one oddly backwards area of Africa) for drive-on-left. Surely, if you're a reasonable person, you must see similarities in those maps.

    8. Re:International Units please by Anonymous Coward · · Score: 0

      what? give NAMES to STREETS? Blasphemy!

    9. Re:International Units please by Clsid · · Score: 0

      Why should they? It is the measurement system used in the US and this is a US based website. If you don't like it, go read Slashdot Europe or something.

    10. Re:International Units please by DNS-and-BIND · · Score: 1

      Tell you what, bub. Why don't you make your own European Slashdot? Then, you can not only have metric units, but social justice in every story. It'll be bliss! The best part is you get to give the old-fashioned Slashdot.org the finger and do your own thing. It will be a loss accepting your departure, but we'll just have to muddle along without you. Good luck in your new venture!

      Unless this is all a lie and you just enjoy flaming Americans for being what they are, Americans. What are "sick measurment units" anyway? On your new site you can abolish English and use proper languages. Off you go!

      --
      Shutting down free speech with violence isn't fighting fascism. It IS fascism!
    11. Re:International Units please by thegarbz · · Score: 0

      Never, and people who complain about it are hypocrites. It's not incumbent on others to deal with your inconveniences.

      Ladies and gentlemen the USA in a nutshell. Everyone should be like us in an international world because we are teh bestest. Yes we may be the only people who do it this way other than some 3rd world shithole, but we are so awesome that it doesn't matter and we won't make it any easier for the vastly larger population of the rest of the world to understand us.

      America already is great. Vote Clinton.

    12. Re:International Units please by Anubis+IV · · Score: 1

      when will US posters finally stop using imperial

      We'd have to start using them first.

      A) America uses American customary units, which were derived from colonial era English units. British Imperial units share a common heritage, in that they were derived from those same English units as well, but the Imperial system was created in 1824, after America's independence, so the two countries diverged, resulting in the two systems having a number of differences.

      B) Brits still use miles in everyday practice, so feet are consistent with the system already in common use. Moreover, shows like Top Gear (which is about as much exposure as most Americans get to British people using units) still use inches and feet on occasion, so it's unsurprising that a poster would assume all/most English speakers would be versed in using them.

      C) Given that things don't magically become metric when they're smaller than a driving distance, isn't it a bit pretentious to expect that others keep up to date with your particular country's mix-and-match of systems? Assuming that you are indeed British, are we really expected to know that feet and inches aren't okay to use these days, even though miles are fine? You're on good terms with pints, but you'll complain if I use cups? And then there's kilos, pounds, AND stones in everyday use, but not hundredweights or certain varieties of tons/tonnes? Or have stones stopped being used this week and I missed the memo?

      My point is, the world is a messy place, and when it comes to units it will continue being messy until the world standardizes on a particular system. We can all look forward to that day eagerly, since it'll mean silly posts like mine and yours won't be around. In the meantime, do what the rest of us do: convert the units without complaining.

  11. I like big butts... by Anonymous Coward · · Score: 0

    ...those that cannot fly.

  12. No internal structure? by Viol8 · · Score: 3, Interesting

    Is that a good idea? Sure, it saves weight, but if it ever suffers partial deflation in the air there will be a total loss of control preventing them even attempting a crash landing as the aerofoils and props start pointing in random directions.

    1. Re:No internal structure? by Waffle+Iron · · Score: 1

      That's a stunning revelation!

      You'd better contact the Goodyear company ASAP. It looks like they've been putting people in incredible peril for over 90 years now with their fleet of deflatable blimps. You've got to stop them!

    2. Re:No internal structure? by Blaskowicz · · Score: 1

      Given the effects of scale, a leak should be a ton less dramatic than most people would imagine. Even on a car or bicycle a leak can be very slow, it'd be more like that than what happens humorously in cartoons.

    3. Re:No internal structure? by amicusNYCL · · Score: 1

      preventing them even attempting a crash landing

      Don't worry, no one has ever failed to make an attempted crash landing.

      --
      "Our two-party system is like a bowl of shit looking at itself in a mirror." - Lewis Black
    4. Re:No internal structure? by Viol8 · · Score: 1

      You moron. Its not a blimp - its part airship, part aircraft. Try engaging your brain before you post next time.

    5. Re:No internal structure? by Waffle+Iron · · Score: 1

      So what? If the blimp deflates, it also becomes uncontrollable sinks.

    6. Re:No internal structure? by Viol8 · · Score: 1

      A blimp doesn't have aerodynamic surfaces and engines that provide a significant proportion of the lift. Did you RTFA?

    7. Re:No internal structure? by Waffle+Iron · · Score: 1

      By the time either a blimp or this thing deflates enough to make the engines flop around, there isn't going to be nearly enough lift of lift of any kind to keep it in the air.

      But let's ignore that: You want to do this to a rigid airship.

      Look at their history. Excluding the ones that burst into flames, many if not most of the major airships ever built ended up lost due to failure of their internal structures. They got shredded like pretzels with the slightest adverse aerodynamic forces. (Even the Hindenburg disaster probably initially involved the snapping of an internal bracing wire due to overzealous steering.)

      If I had to ride in one of these white elephants, I'd still go with the inflatable version.

    8. Re:No internal structure? by Viol8 · · Score: 1

      "By the time either a blimp or this thing deflates enough to make the engines flop around, there isn't going to be nearly enough lift of lift of any kind to keep it in the air."

      No. It would only take the wings and the engines to be out by a few degrees to make it uncontrollable.

  13. "Minor setback"? by sjbe · · Score: 2

    Hydrogen is cheaper and more abundant, but because of one minor setback 80 years ago the idea has been senselessly abandoned.

    You have a very curious definition of "one minor setback".

    Imagine the same principle was applied to other aircraft and we abandoned the whole idea as soon as one thing went wrong

    The problems with other aircraft had solutions. The problem of using highly flammable hydrogen gas is an irreducible hazard. Helium can work as a substitute but our supply is limited on Earth and getting more will be expensive.

    Engineering and design methods have improved considerably in 80 years, and we could now likely make a very safe hydrogen airship, but people have an unfounded fear of the idea.

    Really? We've solved the problem of hydrogen gas being highly flammable? When did that happen?

    1. Re:"Minor setback"? by Anonymous Coward · · Score: 0

      The supply of hydrogen is limited on Earth also but since it's the most abundant element in the universe it isn't a big deal. Helium is the second most abundant element in the universe... So meh.

    2. Re:"Minor setback"? by Anonymous Coward · · Score: 0

      If you're referring to the Hindenburg...

      1) The death toll was 35. Yes, really. Most of the people on-board survived. (To be exact, 62 people survived out of 97.)
      2) Have you ever seen a hydrogen "explosion"? It goes "poof". Most hydrogen doesn't burn in a hydrogen explosion because it's so much lighter than air. Due to this, a hydrogen flame is always (yes, always) short-lived and vertical. The Hindenburg didn't burn that way, so something else must've been fueling that fire.
      3) And that fuel was the wooden frame. Duh.
      4) Oh, and it was painted with thermite . Aluminum and iron in paint makes it shiny and heat-reflective. Also, explosive. The instant the landing tether grounded the craft in the rain, and with that much static (read: lightning) in the air around it in the storm, it's not amazing that it sparked, burned, and crashed to the ground.

      So, the answer here is to try hydrogen again as a lift gas, not to abandon it due to a minor accident caused by paint.

    3. Re:"Minor setback"? by Anonymous Coward · · Score: 0

      "The problem of using highly flammable" LIQUID

      You do realize that aircraft are filled with flammable liquid right, and throughout history there have been accidents with it that make the Hindenburg look like a fire cracker compared to a stick of dynamite. No doubt that there are major challenges in dealing with it due to the volume involved but they are not all that different from the challenges in preventing a planes wing from going up like a roman candle.

    4. Re:"Minor setback"? by Sperbels · · Score: 1

      Except for the slight problem that it doesn't stay anchored to the earth like hydrogen.

  14. What is the point? by Anonymous Coward · · Score: 0

    10 tons of cargo at 90 miles an hour? The next gen is going to have a cargo capacity of 50 tons.

    A Boeing 747 moves 154 tons of cargo at 570 mph.

    An 18 wheeler carries something like 22 tons at about 70 mph.

    So can someone explain what the point is? Is it because it uses significantly less fuel than a Boeing or an 18 wheeler? Seems unlikely to replace either as a preferred means of transportation of commercial goods.

    As to the military, seems easier to shoot down than a 747, so not sure why its a better option there either.

    1. Re: What is the point? by Anonymous Coward · · Score: 0

      Well, about 1/3 the fuel and hopefully about 1/3 the construction cost. Unlike a cargo jet, it doesn't need a large airport to service an area. Unlike a truck it is independent of roads and it can take cargo of large, irregular size. Unlike a boat, it can go where there is no water, and it's faster.
      Unlike all of these, you usually will not need to do m multiple load/unload cycles s while you move from one transport method to another, reducing cost and loss to theft at the docks.
      So, that seems cool.

    2. Re:What is the point? by BorelHendrake · · Score: 1

      One area of potential use has been in the remote regions of Africa for mining purposes. 18 wheelers need roads to be built. 747 can't land there. This guy comes in with 10T of equipment/supplies/people and your costs and time of getting a remote industrial site up and running is greatly reduced.

    3. Re:What is the point? by legRoom · · Score: 2

      So can someone explain what the point is?

      It targets two major use cases, neither of which can be serviced by a conventional cargo jet or a road vehicle:

      1) Ferrying heavy cargo (and possibly people) to or from a land-locked location that lacks a suitable runway or road/rail connection. This is of special interest to the military, but also has civilian applications.

      For the military, truck transport through enemy territory is extremely dangerous for obvious reasons - possibly even more dangerous than using an airship, depending on what technology the enemy has access to. An airship may be a big target, but it can also fly high enough that most ground weapons can't even hit it. If it does get hit, a few small holes in the envelope (say, from a machine gun) won't immediately end the mission. A large one is also at least twice as fast as a military ground convoy, and has more tactical options available for avoiding the enemy, since it doesn't need to follow roads.

      Truck transport through neutral territory is safe - for the military convoy. It's not safe for the neutral country though, as allowing military convoys to pass their borders may be considered an act of war by the enemy. For this reason, it can be very difficult to get permission from neighbouring countries to use ground transport into a land-locked war zone. Air transport is less problematic (I do not say problem-free) in this regard.

      As for conventional cargo jets like the 747 - their survivability probably isn't as much better than an airship as you might think. Big subsonic jets are easy to shoot down for anyone who has access to large 1970s anti-aircraft missiles, like the Sidewinder or the S-300. So, cargo jets won't last long unless the user has air dominance in the area of operations. A lifting-body airship should still be able to fly high enough to keep out of range of small arms like machine guns, and arguably is not that much more vulnerable than a 747 in practice. It would have to stay a bit further from the front lines though, because it cruises low enough to be at risk from short-range stuff like Stinger missiles, and maybe auto cannons.

      For any user (whether military or civilian), the advantage of an airship is that it doesn't need a huge, expensive concrete runway at each end of the journey. For the military, taking weeks or months to build such a runway isn't always an option. Even when a suitable runway is available, it could be disabled by the enemy at any time with a few bombs or artillery rounds. For civilian users, there are projects set in remote areas for which the expense and/or environmental impact of installing a city-grade runway is just not worth it. Dirt roads are usually (though not always) an option, but some exceptionally heavy, bulky cargo can't reasonably be moved via a steep, narrow, windy, muddy road.

      2) Because airships can stay aloft so much longer before they need to refuel, they are well-suited to loitering over an area to provide a communications relay or an observation platform. This has civilian applications, as well as military. If you only need to cover a relatively small area (hundreds of square kilometres, rather than thousands), they are much cheaper than satellites. The ability to easily relocate them and swap or upgrade the payload makes them more flexible.

      Even for military users, their greater vulnerability isn't always a problem: the military is tasked not only with taking enemy territory, but also with patrolling friendly territory. An enemy trying to sneak in cannot shoot down a patrolling airship without revealing his presence.

    4. Re:What is the point? by Sperbels · · Score: 1

      Also worth pointing out, these don't even need crew or pilots.

    5. Re:What is the point? by legRoom · · Score: 1

      For loitering missions, that's true. However, for cargo - and especially sky crane - missions, I'm pretty sure that a human crew will be required for many years to come. Safely and quickly handling arbitrary cargo while squeezing as much capacity as possible out of the vehicle is a complex task (both mentally and physically) that can't really be automated yet.

      Still, at least for the military, the future 50+ ton capacity models should require far fewer crew members per cargo ton-kilometer than ground convoys, if only because the armed escort can be (mostly) eliminated.

    6. Re:What is the point? by Anonymous Coward · · Score: 0

      Nice answer, thanks. -Your friendly anonymous coward / can't be bothered to log in

  15. Yes! Solid and lighter than air... by Anonymous Coward · · Score: 0

    The lifting capacity goes up on a cube function as the craft gets bigger, but the weight goes up on a square function. With a big enough craft, you can make the hull out of concrete block and let atmospheric pressure hold it in shape (spherical, clearly).

    1. Re:Yes! Solid and lighter than air... by Rei · · Score: 3, Insightful

      It's not exactly a cube/square scaling. Because the larger you make it, the larger the tensile loads per square meter, meaning the stronger the envelope needs to be. Without upgrading to a higher tensile envelope, this means increasing thickness.

      If you want to view it from a cross-section perspective, tensile strength is measured in pascals - aka newtons per meter squared (cross section). If we're taking a 1-meter slice, it's newtons per ~meter thickness. Pressure is likewise pascals - newtons per meter squared (area). From the same a 2d slice perspective, that's newtons per ~meter (perimeter). The higher the perimter, the higher the number of newtons force. But the number of newtons the envelope can withstand doesn't have perimeter in its divisor, it has thickness in its divisor. So thickness and perimter cross section must increase in accordance.

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
    2. Re: Yes! Solid and lighter than air... by Anonymous Coward · · Score: 0

      Is it approximately cube/square scaling? I bow to your more detailed understanding, but if it is approximately cube/square, then it seems the answer to his question is still yes.

    3. Re: Yes! Solid and lighter than air... by Rei · · Score: 1

      No. To sum up, it's cube/cube scaling. Volume goes up by r cubed, area goes up by r squared, thickness goes up proportional to r, envelope mass goes up by area times thickness, aka r cubed. So r cubed to r cubed.

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
    4. Re: Yes! Solid and lighter than air... by Rei · · Score: 1

      That is, of course, if you don't simply go to stronger fabrics instead. Which is usually the goal rather than increasing fabric thickness. Look to vectran (like this airship is using) - not just incredible strength, but also amazingly low gas permeability, comparable to something like EVOH without the water sensitivity. Also extremely low creep. It is however like a lot of plastics UV sensitive, so it has to be protected. Another option is high tensile fiber-reinforced plastics with a biaxially oriented membrane, like cuben (although for airship applications on Earth, advanced aramids like vectran are probably better)

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
  16. This is just the sir mix a lot version of by Anonymous Coward · · Score: 0

    The Blimp from "A view to a kill" way to bring back the 1980s!

    1. Re:This is just the sir mix a lot version of by William-Ely · · Score: 1

      You beat me to it. Maybe it will be featured in the remake.

      --
      Mod me down with all of your hatred, and your journey towards the dark side will be complete!
    2. Re:This is just the sir mix a lot version of by SpinyManiac · · Score: 1

      Actually they were both designed by the same guy - Roger Munk.

      --
      It's never too late to have a happy childhood.
  17. Better solution than Helium by PortHaven · · Score: 1

    We need to develop materials that allow us to create airships using vacuum (even lighter than hydrogen).

    =)

    1. Re:Better solution than Helium by Sperbels · · Score: 1

      And vacuum doesn't burn.

    2. Re:Better solution than Helium by PortHaven · · Score: 1

      Bummer....

      Now where's the fun in that?

  18. Economic availability by sjbe · · Score: 1

    The supply of hydrogen is limited on Earth also but since it's the most abundant element in the universe it isn't a big deal

    The supply of hydrogen on earth is effectively unlimited. We have literally oceans of it plus vast amounts of hydrocarbons as well. Compared to the amount of helium available economically to us we have all the hydrogen we are ever likely to need.

    Helium is the second most abundant element in the universe... So meh.

    Doesn't matter how abundant it is if you can't get it economically.

  19. Solar Powered Flying Butt? by kires · · Score: 1

    Would it be at all feasible to cover the top of this thing with thin and semi-flexible solar panels? If Solar Impulse can make it around the planet using just the solar energy hitting its thin little lifting surfaces then surely the surface area of this magnificent flying backside should be able to gather enough energy to shove it across the sky, right?

    1. Re:Solar Powered Flying Butt? by legRoom · · Score: 3, Informative

      Would it be at all feasible to cover the top of this thing with thin and semi-flexible solar panels? If Solar Impulse can make it around the planet using just the solar energy hitting its thin little lifting surfaces then surely the surface area of this magnificent flying backside should be able to gather enough energy to shove it across the sky, right?

      Going off the Airlander 10 specs:

      The vehicle is powered by "4 x 325 hp" diesel engines, for a combined peak power of about 960 kW. Most vehicles do not cruise at peak power continuously, so I will estimate the average power requirement at half of that: 480 kW. (This ratio would be approximately correct for a large subsonic jet; if someone knows what it should be for a diesel-powered lifting-body airship instead, please leave a comment.)

      The useful surface area of the Airlander 10 is approximately [92 m long] * [43.5 m wide] = [4000 m^2]. (The exact number depends upon the latitude, the time of day, and the craft's heading, but it turns out that its shape is such that the answer doesn't change much, except near the poles.) Peak solar irradiance (direct sunlight at high noon) at ground level is about 1 kW / m^2, and current thin film solar panels are under 15% efficient. Solar power conversion circuitry is around 90% efficient, and an appropriate electric motor with its controller is about 88% efficient. Therefore, a maximum of [4000 m^2] * [1kW / m^2] * [15%] * [90%] * [88%] = [475 kW] of shaft power could be generated by solar-electric means.

      So, a solar-powered Airlander 10 could work - but not very well. Under ideal daylight conditions, it could fly about as well as the hydrocarbon-powered version. However, airships are sufficiently slow and long-range that they are expected to routinely fly through the night. Thus, the average power available must be at least cut in half, to 238 kW. Cloud shadowing (airships can fly over some clouds, but far from all) and dust will further reduce that number.

      Additionally, a solar-powered airship needs to carry heavy batteries in order to avoid catastrophic power loss when passing through clouds. One hour's worth of lithium-ion power would mass [475 kW*h] / [86% charge/discharge efficiency] / [200 W*h / kg] / [80% - 20% depth of discharge range limit] = [4600 kg]. As the total mass of the Airlander 10 is only 20 metric tons, it cannot carry much more battery power than that without cutting into the payload.

      At cruise, nearly all of the Airlander 10's power is devoted to fighting drag. Since subsonic drag scales with the square of airspeed, a solar-powered version could quadruple its battery-powered run time by halving its speed. (It can't really go any slower than that though, as it needs to be able to overcome typical headwinds to be useful.) Four hours of battery time is still woefully inadequate for an overnight flight though, so a solar-powered version would be limited to daytime flights only, and consequently to overland flights only.

      TLDR: A solar-powered version of this airship is possible, but it would be considerably slower and incapable of crossing oceans. Supplemental charging on the ground wouldn't help much at all.

    2. Re:Solar Powered Flying Butt? by Anonymous Coward · · Score: 0

      Minor detail:

      It's an airship. It doesn't have to maintain power overnight. They can just turn the engines off and bob around for awhile. With favourable winds, they might just do that anyhow... (yeah, they'd want at least steerage way, so not quite zero, but you get the idea).

      They did that with the Graf Zepplin one day. On its way from Germany to Brazil a coup attempt occurred, and they just turned off the engines and hovered around offshore for awhile until the radio confirmed things had all settled down.

      AC

    3. Re:Solar Powered Flying Butt? by legRoom · · Score: 1

      It's an airship. It doesn't have to maintain power overnight. They can just turn the engines off and bob around for awhile.

      Not this one: it's not actually lighter than air. Even at sea level, its displacement is only enough to lift about 94% of its weight. At cruising altitude, 40% of the lift must come from aerodynamic effects.

      If all you're trying to do is maintain altitude, it is certainly possible to extend the battery life by flying much slower and lower - but the lower you fly, the more vulnerable the airship is to weather-induced accidents. Maybe you could make it through the night, if the weather was good, but there wouldn't be nearly enough safety margin for routine operations, I think.

    4. Re:Solar Powered Flying Butt? by Anonymous Coward · · Score: 0

      Why does it have to be all or nothing?

      Using solar power could just as easily be used to decrease the amount of fuel you need to bring (e.g in a diesel electric setup) and/or in general augment/complement your "main" propulsion system.. or even the reverse, be the main propulsion system, with some backup to make up for the cases when it's not enough.

      ----------------
      | Thinking |
      ----------------

      Sigh.

    5. Re:Solar Powered Flying Butt? by legRoom · · Score: 1

      Why does it have to be all or nothing?

      Suppose we ditch the heavy batteries and replace them with a diesel generator that kicks in whenever there is insufficient sunlight:

      Pros: Fuel consumption during daylight hours is reduced by around 50%. For multi-day trips, the reduction is closer to 25%.

      Cons: The additional high-power electric motors, wiring, and power buffering together add substantial weight to the vehicle, as compared to a normal diesel-only model. This will reduce either the fuel load that can be carried, or the payload - maybe -1 ton?

      Additionally, the cost of the airship will be increased by at least $3 million USD. (Reasoning: High efficiency thin-film solar cells cost something like $1 USD/Watt. Covering the top and sides of the envelope takes about 1.6 MW. The rest of the money covers motors, wiring, power buffering, profit margin, etc.)

      Cost:Benefit analysis: Assuming an average duty cycle of 50% (probably an over-estimate), the lifetime fuel cost for the normal diesel-powered airship is around [480 kW average shaft power] / [40% engine efficiency] * [60 s/min] * [60 min/h] * [24 h/d] * [365.25 d/y] * [25 y] * [50% flying time] / [35.8 MJ/L of diesel] * [$1.20 USD / L of diesel] = $15.8 million USD.

      A solar hybrid reduces that by [$15.8 million USD] * [30%] = $4.76 million USD - if we ignore the increased maintenance costs from the added complexity, and assume that the airship is kept very busy (in the air at least half of the time).

      Conclusion: Upgrading the Airlander 10 to use a solar hybrid propulsion system isn't a good investment right now, unless you really want the modest range increase - but it's very close, and will probably become so within a decade or two, given the rapid pace of development for the key component: the thin-film solar cells.

      Having said that, solar airships are subject to the square-cube law. The larger the airship, the less benefit it can derive from adding solar panels. The Airlander 10 is actually rather small compared to what most of the next-gen airship companies want to build, so it's unlikely that solar power will play a major role in the industry.

    6. Re:Solar Powered Flying Butt? by legRoom · · Score: 1

      Having said that, solar airships are subject to the square-cube law. The larger the airship, the less benefit it can derive from adding solar panels.

      Actually, I'm not being entirely fair here - the propulsion power required during cruise depends not only upon the mass (cube scaling), but also upon the form drag (square scaling). So, the usefulness of adding solar cells does decrease for larger airships, but not as quickly as I implied.

  20. Why airships fell out of favor by sjbe · · Score: 1

    If you're referring to the Hindenburg...

    The Hindenburg was merely the most spectacular airship disaster. It was FAR from the only one.

    So, the answer here is to try hydrogen again as a lift gas, not to abandon it due to a minor accident caused by paint.

    You seem rather fixated on a single accident. Airships fell out of favor because they routinely blew up, crashed, can't handle bad weather, burned, etc in addition to being economically noncompetitive and comparatively slow. I disagree that the Hindenburg was a "minor accident". Nothing that kills 35 people is a minor accident. If that was the only accident ever then perhaps you would have a point but it wasn't the only accident or even close to it.

    Airships fell out of favor for a variety of practical reasons as well. Their power to weight ratio and specific fuel consumption prior to WWII was competitive for long distance operations but since then rigid wing aircraft have surpassed airships for most practical applications.

    Could hydrogen be used safely as a lifting gas? I can't categorically say no but you'll have to provide a LOT better evidence than "technology has improved since the Hindenburg". At this time there is no credible reason to believe the safety problems inherent to using hydrogen as a lifting gas have been solved.

    1. Re:Why airships fell out of favor by Anonymous Coward · · Score: 0

      What a lot of hot air. You are literally saying that technology has not advanced in nearly a century. To top it off you say an accident that killed less than 50 people is as bad as something which has the potential to kill a thousand people at the same time (imagine two A380s pulling a Tenerife). 35 dead is bad, but it's small potatoes compared to what modern aviation kills every year, and that accident alone caused more than FIFTEEN times the number of victims.

      Then you proceed to speak of how airships burn, crash and can handle bad weather.... like aircraft never burns, crash or fail to work in bad weather. Well played.

      I'm certainly no balloon-romantic, but I hate to see bad arguments backed up with such massive doses of hypocrisy. And people literally sitting on hundreds of tons of jet fuel is in no way any safer than people hanging under a few tons of hydrogen. Besides, since hydrogen is light, if things go wrong, most of it will escape as a cloud and burn off above everyone, rather than acting like frying oil. The Hindenburg incident wouldn't have been nearly as bad if the skin hadn't only been combustible, but directly flammable as well.

      I'm certain there are cases where Zeppelins as well as blimps make excellent sense, if for no other reason than that you don't need to invest billions in airports for them to be useful. Unfortunately, I doubt we will see it in practice because of stupid, unimaginative people like you, who think technology stands still, the world never changes and progress can never mean taking a step back.

  21. Lacking one thing Re:Solar Powered Flying Butt? by Anonymous Coward · · Score: 0

    For a real Solar Powered Flying Butt experience, put a member of the Butt family on a solar-powered aircraft.

  22. BOW-CHIKA-WOW-WOW by Thud457 · · Score: 1

    Like two little boys fighting in a sack.

    They should totally do a remake of this advertisement.

    --

    the preceding comment is my own and in no way reflects the opinion of the Joint Chiefs of Staff

    1. Re:BOW-CHIKA-WOW-WOW by Thud457 · · Score: 1

      Also brings to mind this.

      --

      the preceding comment is my own and in no way reflects the opinion of the Joint Chiefs of Staff

  23. FAB by Anonymous Coward · · Score: 0

    Thunderbird 2 is go!

  24. Butt by nycsubway · · Score: 1

    It's also the largest flying butt in the air. That's what my kids would say, especially the 6 year old boy.

  25. ... like a floating cruise ship ... by ninjagin · · Score: 1

    This thing could do the NYC-London trip at a comfortable speed in about three days. At top speed, two days. I wonder what the operating costs are. It might be a great way to travel with amenities.

    --
    .. pa-ra-bo-la, pa-ra-bo-la, 2 pi R, 2 pi R, where's your latus rectum, where's your latus rectum, 2 pi R
    1. Re:... like a floating cruise ship ... by Anonymous Coward · · Score: 0

      If they could tell the TSA to get lost (like Amtrak did at least from last I heard) I know I'd go with a floating cruise ship.

      http://www.cnn.com/2012/02/06/opinion/don-phillips-tsa-vipr-teams/

  26. We'll see by Anonymous Coward · · Score: 0

    If a company called Worldwide Aeros Corp gets some funding they won't hold that "largest aircraft" title for long. Until a piece of a military hanger came down on it the demo craft (Aeroscraft) was 600,000 cubic feet (vs about 1.3 Million for the articles craft). The full sized versions they want to build will have CARGO bays of 1.8 Million cubic feet, larger in volume than this entire craft.

  27. Aerospace is still entrenched in imperial units by Solandri · · Score: 1

    So feet is in fact the "correct" units to use here.

  28. Not the first flight either by Anonymous Coward · · Score: 0

    A previous version first flew in 2012 from Lakehurst, NJ (the sight of the Hindenburg disaster)(https://youtu.be/w8sGP7iB-5c). The program was cancelled by the Army a year later. The manufacturer took it back to the UK to continue development there. (http://www.defensenews.com/story/defense/policy-budget/industry/2016/05/12/lemv-hybrid-airship-air-vehicles/84270692/). It was a disappointing move by the Army because these large airships or hybrid air vehicles are a perfect airborne radar platform. It's a shame that the Army couldn't partner with another service or agency to jointly fund the program. It's a good thing the manufacturer isn't giving up though. I'm sure the DOD will be back with a large pile of cash once they fully realize their mistake.

    1. Re:Not the first flight either by Rei · · Score: 1

      There's a lot to like about them. With modern fabrics, helium leakage is extremely low - and venting generally isn't needed on a hybrid. Speeds are faster because the reduced buoyancy requirements mean a lower cross section. Landing is easier because of easier buoyancy control and, again, a smaller cross section. It's just in general a nice platform concept.

      --
      "99 dead duelists of Dios on the wall. 99 dead duelists of Dios! Take one's ring, pass it around..."
    2. Re:Not the first flight either by budgenator · · Score: 1

      The problem with the Army doing R and D is they are constitutionally limited to a 3 year funding cycle. It often takes longer than that to spec out requirements for bids.

      --
      Apocalypse Cancelled, Sorry, No Ticket Refunds
    3. Re:Not the first flight either by Coren22 · · Score: 1

      Also, I am not sure what AC is talking about.

      http://www.baltimoresun.com/ne...

      Just because the Army canceled this program does not mean they have given up on balloon lifted radar installations.

      --
      APK likes to ask for responses to the same things over and over. Maybe he just likes the responses?
  29. MAYBE IF =FBI= FLEW IT OVER THE MEXICAN BORDER? by Anonymous Coward · · Score: 0

    It would have value?

    Think long and hard about your future employment FBI BurEAU HeaD

  30. Oh... by zawarski · · Score: 1

    the humanity?

  31. LTA Vehicles by Anonymous Coward · · Score: 0

    I think that Lighter Than Air vehicles have disadvantages that are very well known. The people promoting these are usually True Believers who think those disadvantages don't matter. They are always wrong.

    The problem with an LTA vehicle is that it is lighter than air. In order to get any decent lifting capacity you need a light weight, and very large, envelope. A skin to hold the lifting gases in. The LTA envelope means that the cross-sectional area of the LTA vehicle is huge. It helps (a bit) that it is streamlined, but the streamlining only works in the head-on direction. And even in that direction, the thrust generated by the motors on the LTA vehicle can easily be negated by a strong headwind. It's worse with a tailwind, and worst of all in a crosswind.

    Take a heavier than air vehicle. The power of the engines is sufficient not only to keep the vehicle in the air, but HTA vehicles can routinely fly in bad weather. In fact many successfully fly through thunderstorms and even hurricanes. If you ever tried that in a LTA vehicle, they would find the deflated envelope and your lifeless body weeks later and hundreds of kilometres away.

    Too extreme of an example? How about this then. A commercial blimp flew across the North American continent about 10 years ago. It had to fly across the Rocky Mountains, a daily event of little note in a conventional airplane. The blimp had to wait 3 days for calm air, it could only fly through a mountain pass, it could only be done at a specific time during the morning, and the pilots were on edge the entire crossing, concerned that the weather would change. This wasn't stormy weather you understand, this was ordinary air currents found every day in the Rockies.

    Blimps are at the mercy of the winds, and winds are kind of fundamental to flying. And no, a rigid internal structure, fancy buzzwords and "modern technology" changes none of that. LTA vehicles have too big of a cross-sectional area and cannot deal with high winds.

    1. Re:LTA Vehicles by legRoom · · Score: 1

      I think that Lighter Than Air vehicles have disadvantages that are very well known.

      The Airlander 10 is actually somewhat heavier than air, and relies upon aerodynamic lift to stay aloft. Does this reduction in surface area and buoyancy, combined with modern technology, improve the concept enough to make it practical? I don't know, but it's already been built so there's no need to guess: just wait and see.

      The people promoting these are usually True Believers who think those disadvantages don't matter. They are always wrong.

      For the record, I am not a "True Believer", nor am I really trying to promote the airships. But, I do object to the idea that airships are strictly inferior to jets and trucks - they have, in theory, their own niche that cannot really be served by either of those alternatives.

      If the resurgence of investment in airships doesn't lead anywhere useful, it will be because the revised designs fail to serve their target niche, not because they are out-competed by two technologies that can't serve the niche at all. The real competition is probably helicopters (despite their awful fuel efficiency) and smaller military cargo planes like the C-130, which can operate from much smaller, cheaper runways than a 747.

      The blimp had to wait 3 days for calm air, it could only fly through a mountain pass, it could only be done at a specific time during the morning, and the pilots were on edge the entire crossing, concerned that the weather would change.

      The Airlander 10 has a service ceiling about twice that of a typical blimp, and could cross the Rockies safely almost anywhere.

      I don't know about the weather restrictions though; that is my biggest concern with airships, as well. But again, they've already started test flights, so they won't be able to hide it for very long if the restrictions are really severe.

  32. Obligatory Snow Crash Quote... by IonOtter · · Score: 1

    "When it gets down to it -- talking trade balances here -- once we've brain-drained all our technology into other countries, once things have evened out, they're making cars in Bolivia and microwave ovens in Tadzhikistan and selling them here -- once our edge in natural resources has been made irrelevant by giant Hong Kong ships and dirigibles that can ship North Dakota all the way to New Zealand for a nickel -- once the Invisible Hand has taken away all those historical inequities and smeared them out into a broad global layer of what a Pakistani brickmaker would consider to be prosperity -- y'know what? There's only four things we do better than anyone else:
    music
    movies
    microcode (software)
    high-speed pizza delivery"

    --
    [End Of Line]
  33. Can we name it by Anonymous Coward · · Score: 0

    Crafty Mc ButtFace?