Do that and your face becomes the target for any loose items in the cabin that decide to make a break for freedom during the emergency breaking or the violent deceleration that happens when the aircraft goes off the runway etc
So wear face protection. And while you are at it, clothing with a degree of fire resistance. It seem to me that we are not doing enough to help people survive that (fairly common) scenario.
how does the spacecraft survive in those temperatures?
The density is very low. The body of the spacecraft might get hit by individual molecules which have that temperature, but what are a few thousand molecules going to do to it?
Could somebody explain how exactly the solar system has an innate 'shape'? I would think that that would be human-defined, not an actual, measureable feature.
Well the Sun has an innate shape. It is mostly a sphere, flattened a little bit by rotation. Other factors such as magnetic fields will play a part.
The solar wind is really the outer part of the sun, so in one sense we are embedded in the sun, and it flows around our planet. It has long been expected that the solar wind would meet the interstellar medium at some sort of bow shock on the upstream side with a tail of sorts on the downstream side.
This article suggests that magnetic fields which exist between stars also affect the shape of the boundary between the solar wind and whatever is outside it. Instruments on the Voyager spacecraft tell us which medium it is in at any point in time.
And when you're going at terminal velocity, the water's surface would feel about as hard as cement
Hit concrete and you might decelerate over 0.1 metres. Hit water feet first and you might decelerate over five metres. Thats 50 times the distance so divide the acceleration by sqrt(50)==7. Its probably not as good as that because acceleration will be proportional to velocity. So I half agree with you. I think peak acceleration will be 0.5 or 0.3 of hitting a solid surface.
There are floating vests not parachutes in planes now for a reason
When I think about the crappy PFD's which you get on aircraft I wonder why they can't be better. They should inflate on immersion. A better harness wouldn't hurt. And while you are it it why not have a simple parachute?
Materials these days are pretty good, so it won't take much space.
Re:OB In Soviet Russia
on
Flying Humans
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· Score: 1
there were stories of how the Russians would drop airborne troops by flying very low and dropping them into to snow drifts.
Then there was this guy who was flying an ultralight in an air race somewhere in Europe who landed in a field and didn't see the abandoned machinery because of grass/crops/etc.
It would be nasty to find a tree stump inside your nice soft snow drift.
i wonder if being in the relaxed state of unconsciousness would make any difference to the injuries sustained when you hit the ground... as you probably would be in a fall from a high enough altitude
I doubt it. Most likely you will have the same injuries regardless of your state of conciousness.
I have heard that people who fall from airliners into water are often found to have died of drowning, which makes me think a fall into water at terminal velocity is borderline survivable.
Evolution is most likely encouraged by viruses. The reason is that they will grab a snippet from one person (and other entity), and insert it into our genomes.
So how about those humans who engage in behaviour which promotes the spread of viruses, and tend not to reproduce? Perhaps they are genuinely participating in evolution, appearances to the contrary.
Did they have their own coal burning power plant or some other monster UPS that couldn't be unplugged?
We had a huge power conditioner for our PDP 11's which was sort of a UPS. It had a huge inductor inside. Once I had to transport it in a front drive station wagon. We couldn't slide it forward of the rear axle (too heavy) so the front wheels were just barely on the ground.
The DEC boxes had a power control box in the bottom of the racks. Switching the rack on or off would result in a huge clunk from the relays.
Yeah, that particular machine was an 11/45 running RSTS/E. That was a sweet machine and O/S learning programming and systems fundamentals. Oh, it had FORTRAN, COBOL, and assembly too, for the masochistic Comp Sci students.
Back when the alpha came out there were a bunch of old-timers in DECUS Australia looking at a port of RSTS to the alpha. I don't know if anything came of it though.
When I first saw the words "Crowdsourcing Software Development" it reminded me of the coding practices of the Federal Government in Snow Crash, where Y.T.'s mother worked on a tiny piece of code with no idea of what she was actually contributing to. Basically the coders would each handle one function and know nothing of the whole. Entire departments probably wouldn't even know what they were working on as the contracts were huge and the projects enormous. It was a cool concept (actually that whole chapter on Y.T.'s mom was a great read), just hope it never pans out.
The whole Feds thread in Snow Crash was ripped off in the Matrix. Its a shame Neal Stephenson didn't get credit for it.
Crowdsourcing is the total opposite of this scenario. The way the Feds do it is pretty close to how commercial software is developed today in some large companies.
He is not saying that Morse code should not be used. Rather that the users should not be required to LEARN morse code. Morse code can remain the encoding for transmission but the device can provide the a less arcane interface like a keyboard and a small display for the operator.
Yeah but its pretty embarrassing that aircraft pilots have to learn CW and radio operators do not.
I never got my radio license but I am glad I learnt morse code. And Braille for that matter. Its handy to know.
If planes reliably had a situational-awareness monitor, UAVs would be a non-issue. We have the technology - your $300 Garmin has more than enough processing power for this and already has all the latitude/longitude/altitude information it needs to make this work.
Until a couple of years ago my dad flew tugs for a glider club here in Australia. Like me, he is an old hacker and spent some time working on a TCAS like system for the gliders. Its pretty much what you described. A COTS GPS and some simple communication gear.
I was at the club with him one day and helped a pilot change a wheel on a glider. Its a one bolt job. Very simple. The pilot reminded me not to talk about it too much because they have to get a LAME out to do stuff like that. Maybe that profession is the source of come of the conservatism.
Due to the energy budget, they cannot install an SSR transponder.
Ummm, maybe. They need power for communications anyway, and COTS mode C/A and mode S transponders are not designed for low power electrical systems, but they probably could be.
What you need in such case is a direct link to air traffic control to tell that your autonomious plane is lost so that they can clear a part of the airspace. Now, since your aircraft is no longer controlled by a "ground pilot", who is going to make the call?
I think the ground control position for the UAV needs to be outfitted as an aircraft. It should have HF/VHF communication capabilty, and possibly CPDLC so that it can communicate with ATC, even if the current state of the UAV is problematic.
Additionally I think the UAV needs to have a set of reasonably safe degraded modes, eg, when out of communication return to base and land. When unable to maintain controlled flight deploy a ballistic parachute.
I think all this will come in time. But there will have to be a line of software development for civil as opposed to military applications.
Huh, DEC's FX!32 did both in the 90's to allow NT4 x86 programs to be run and then dynamically recompiled for use on the Alpha port of NT.
We had that for VAX to Alpha conversion in OpenVMS as well, but it wasn't perfect. Some programs with a lot of low level bit manipulation would refuse to work on the alpha.
I suspect that an audio/video codec would be in that category.
Man, I don't know if I could sleep knowing that my spacecraft had a leak. What if it gets worse? I sure hope they have some good safeguards against this small leak quickly turning into a decompression.
Well during the apollo program astronauts spent more than seven hours outside in a pressure suit, driving around the countryside as much as 10km away from the LM.
Before going outside they did a leak test on their suits and a loss of less than 0.3 PSI over two minutes was considered acceptable.
This leak is much smaller than that. A typical airliner would leak down to ambient pressure in a couple of minutes without constant pumping of air. That fact isn't the reason I find it hard to sleep on planes.
This is a slow leak (the second in the last couple of years IIRC) and they have plenty of air available to make up the loss. For a while, anyway.
Oh OK thanks for that. I did a scan of qmail.org, netqmail, life with qmail and some parts of DJB's qmail site, in the section on licensing. I was looking for the exact statement you pointed me to.
The reason I ask is that I read some releasing a new version of netqmail with smtp auth patches in it, and this is really waiting on DJB to do something about this issue.
My servers are currently taking a big hit from spam and a clean way to block it in smtpd would make life a lot easier for me.
112 - which is a 3-in-1 ambulance, police and fire dept number. And it's specific for cellphones
I don't think it is. I have heard of european phone techs accidently pulse dialing 112 when they make a connection because it is easy to make a few taps.
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Yes but what is the meteor flux out around Pluto? Pretty low, I suspect.
So wear face protection. And while you are at it, clothing with a degree of fire resistance. It seem to me that we are not doing enough to help people survive that (fairly common) scenario.
If I ever do the transhuman thing and get turned into software, The Oort cloud is where I would want to be for serious durability.
The density is very low. The body of the spacecraft might get hit by individual molecules which have that temperature, but what are a few thousand molecules going to do to it?
Well the Sun has an innate shape. It is mostly a sphere, flattened a little bit by rotation. Other factors such as magnetic fields will play a part.
The solar wind is really the outer part of the sun, so in one sense we are embedded in the sun, and it flows around our planet. It has long been expected that the solar wind would meet the interstellar medium at some sort of bow shock on the upstream side with a tail of sorts on the downstream side.
This article suggests that magnetic fields which exist between stars also affect the shape of the boundary between the solar wind and whatever is outside it. Instruments on the Voyager spacecraft tell us which medium it is in at any point in time.
I am sure you are right. But one day I might pick up an old cargo canopy to carry on board "just in case".
I think airlines should face their seats backwards. Saves having to put your head on your knees during an emergency landing.
Hit concrete and you might decelerate over 0.1 metres. Hit water feet first and you might decelerate over five metres. Thats 50 times the distance so divide the acceleration by sqrt(50)==7. Its probably not as good as that because acceleration will be proportional to velocity. So I half agree with you. I think peak acceleration will be 0.5 or 0.3 of hitting a solid surface.
When I think about the crappy PFD's which you get on aircraft I wonder why they can't be better. They should inflate on immersion. A better harness wouldn't hurt. And while you are it it why not have a simple parachute?
Materials these days are pretty good, so it won't take much space.
Then there was this guy who was flying an ultralight in an air race somewhere in Europe who landed in a field and didn't see the abandoned machinery because of grass/crops/etc.
It would be nasty to find a tree stump inside your nice soft snow drift.
I doubt it. Most likely you will have the same injuries regardless of your state of conciousness.
I have heard that people who fall from airliners into water are often found to have died of drowning, which makes me think a fall into water at terminal velocity is borderline survivable.
So how about those humans who engage in behaviour which promotes the spread of viruses, and tend not to reproduce? Perhaps they are genuinely participating in evolution, appearances to the contrary.
Kurt Vonnegut may have been right after all.
We had a huge power conditioner for our PDP 11's which was sort of a UPS. It had a huge inductor inside. Once I had to transport it in a front drive station wagon. We couldn't slide it forward of the rear axle (too heavy) so the front wheels were just barely on the ground.
The DEC boxes had a power control box in the bottom of the racks. Switching the rack on or off would result in a huge clunk from the relays.
Cripes what speed was the 730? 100Khz?
Back when the alpha came out there were a bunch of old-timers in DECUS Australia looking at a port of RSTS to the alpha. I don't know if anything came of it though.
The whole Feds thread in Snow Crash was ripped off in the Matrix. Its a shame Neal Stephenson didn't get credit for it.
Crowdsourcing is the total opposite of this scenario. The way the Feds do it is pretty close to how commercial software is developed today in some large companies.
Yeah but its pretty embarrassing that aircraft pilots have to learn CW and radio operators do not.
I never got my radio license but I am glad I learnt morse code. And Braille for that matter. Its handy to know.
Until a couple of years ago my dad flew tugs for a glider club here in Australia. Like me, he is an old hacker and spent some time working on a TCAS like system for the gliders. Its pretty much what you described. A COTS GPS and some simple communication gear.
I was at the club with him one day and helped a pilot change a wheel on a glider. Its a one bolt job. Very simple. The pilot reminded me not to talk about it too much because they have to get a LAME out to do stuff like that. Maybe that profession is the source of come of the conservatism.
Ummm, maybe. They need power for communications anyway, and COTS mode C/A and mode S transponders are not designed for low power electrical systems, but they probably could be.
What you need in such case is a direct link to air traffic control to tell that your autonomious plane is lost so that they can clear a part of the airspace. Now, since your aircraft is no longer controlled by a "ground pilot", who is going to make the call?I think the ground control position for the UAV needs to be outfitted as an aircraft. It should have HF/VHF communication capabilty, and possibly CPDLC so that it can communicate with ATC, even if the current state of the UAV is problematic.
Additionally I think the UAV needs to have a set of reasonably safe degraded modes, eg, when out of communication return to base and land. When unable to maintain controlled flight deploy a ballistic parachute.
I think all this will come in time. But there will have to be a line of software development for civil as opposed to military applications.
We had that for VAX to Alpha conversion in OpenVMS as well, but it wasn't perfect. Some programs with a lot of low level bit manipulation would refuse to work on the alpha.
I suspect that an audio/video codec would be in that category.
But now the tag has gone. I didn't know they could be deleted.
Well during the apollo program astronauts spent more than seven hours outside in a pressure suit, driving around the countryside as much as 10km away from the LM.
Before going outside they did a leak test on their suits and a loss of less than 0.3 PSI over two minutes was considered acceptable.
This leak is much smaller than that. A typical airliner would leak down to ambient pressure in a couple of minutes without constant pumping of air. That fact isn't the reason I find it hard to sleep on planes.
This is a slow leak (the second in the last couple of years IIRC) and they have plenty of air available to make up the loss. For a while, anyway.
Thats pounds mass. Gas quantities were measured that way all through the Apollo program.
Oh OK thanks for that. I did a scan of qmail.org, netqmail, life with qmail and some parts of DJB's qmail site, in the section on licensing. I was looking for the exact statement you pointed me to.
Clearly I didn't look hard enough.
The reason I ask is that I read some releasing a new version of netqmail with smtp auth patches in it, and this is really waiting on DJB to do something about this issue. My servers are currently taking a big hit from spam and a clean way to block it in smtpd would make life a lot easier for me.
I don't think it is. I have heard of european phone techs accidently pulse dialing 112 when they make a connection because it is easy to make a few taps.