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[io9] Real-life Futurama tube-transport will catapult you from New York to Beijing in 2 hours - Page 6

post #51 of 163
5/23/12 at 7:07am
Quote:
Originally Posted by ramicio View Post

They've been boring out tunnels for decades now, building these systems. They're not for civilian use, though.

I have retrieved my tinfoil hat...tell me more

Quote:
Originally Posted by Awieos View Post

this thing should have built with material that can withstand such g force and pressure. Its material concept resist should be same as deep exploration submarine who can stand ton of pressure. Person inside will be protected. Safety can be a big issues as this thing start entering service.Many people will argue about it...for sure(business matter). Just hope it not take concord plane path. rolleyes.gif

.....yes?
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post #52 of 163
5/23/12 at 7:12am
Quote:
Originally Posted by Awieos View Post

this thing should have built with material that can withstand such g force and pressure. Its material concept resist should be same as deep exploration submarine who can stand ton of pressure. Person inside will be protected. Safety can be a big issues as this thing start entering service.Many people will argue about it...for sure(business matter). Just hope it not take concord plane path. rolleyes.gif

There won't be much G force, there will probably be 3Gs at the most which is what Formula 1 cars experience when they go around a fast corner sometimes even more, pressure will be different but just as easy to build something that can withstand the pressure. Satellites, space shuttles and other things sent out into space had no problems with no air pressure at all. I'm sure we can build something that can withstand the g force and low pressure in the tubes.
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post #53 of 163
5/23/12 at 7:12am
Quote:
Originally Posted by fivestring View Post

One big "failsafe" would be to have a double layer capsule with the inner being surrounded by water,or other applicable liquid. Sudden g-force acceleration positive or negative is almost ignored when surrounded by a liquid. This would be the best idea in my opinion.

Not only is water heavy and would take a lot of extra energy to move around, it would impart extra momentum to the capsule, making it even more dangerous in the case of a collision or other failure at high speed.
Quote:
Originally Posted by Epitope View Post

I don't see how internet could be delivered. The capsule would be in and out of wi-fi range in a split second. It would be very challenging to maintain any kind of connection.

The capsules will need power and communications.

There is nothing preventing resonant inductive coupling being used for data and power.
Quote:
Originally Posted by Awieos View Post

this thing should have built with material that can withstand such g force and pressure. Its material concept resist should be same as deep exploration submarine who can stand ton of pressure. Person inside will be protected. Safety can be a big issues as this thing start entering service.Many people will argue about it...for sure(business matter). Just hope it not take concord plane path. rolleyes.gif

What g-force and pressure? 1G acceleration and negative ~15 psi of pressure is not much at all.

There is nothing that could reasonably be done to protect the occupants in the case of a catastrophic failure at speed, so such failures will have to be avoided. This is little different from modern aviation, where a catastrophic failure at altitude is almost always fatal.
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post #54 of 163
5/23/12 at 7:32am
Quote:
Originally Posted by Epitope View Post

I don't see how internet could be delivered. The capsule would be in and out of wi-fi range in a split second. It would be very challenging to maintain any kind of connection.

It won't use WiFi hotspots doh.gif There will be WiFi in the capsule but the internet connection will probably be transmitted though the rails somehow. I'm not sure though but I do know my local buses use radio signals to transmit the internet to the buses which has a WiFi router on board.
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post #55 of 163
5/23/12 at 7:50am
Quote:
Originally Posted by Blameless View Post

Not only is water heavy and would take a lot of extra energy to move around, it would impart extra momentum to the capsule, making it even more dangerous in the case of a collision or other failure at high speed..


Not if the outer wall of the capsule is intact after the collision. And the amount of water may not have to add alot of weight. I have never personally experimented with this but, I've seen seen where an egg was put in a centrifuge. First without a liquid buffer and it crussed it at around 5gs. Second time the egg in a Pyrex cylinder filled with water and egg just placed within. The egg lasted to beyond the safe limits of the centifuge.
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post #56 of 163
5/23/12 at 8:05am
Quote:
Originally Posted by Blameless View Post

1G is a substantial amount of acceleration. It means you are being pushed back into your seat with the same force that gravity is pulling down on you with.
At top speed, acceleration would be 0G, because you'd be traveling at a constant velocity.

You're right, sorry, I have a severe headache today. It would be like skydiving, only horizontal.
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post #57 of 163
5/23/12 at 8:05am
Quote:
Originally Posted by fivestring View Post

Not if the outer wall of the capsule is intact after the collision. And the amount of water may not have to add alot of weight. I have never personally experimented with this but, I've seen seen where an egg was put in a centrifuge. First without a liquid buffer and it crussed it at around 5gs. Second time the egg in a Pyrex cylinder filled with water and egg just placed within. The egg lasted to beyond the safe limits of the centifuge.

You misinterpret the experiment. A liquid buffer might distribute the pressure on the exterior shell (of the egg or the capsule) and prevent that from crushing, but it does not magically alleviate the G-forces experienced by the contents. At most it might act as a shock absorber and alleviate transient G-forces, but would not significantly affect the average G-force. And the shock absorber effect could probably be achieved by less massy systems than the several thousand kilos of water your description would require.


@Everyone: I find OCN's lack of physics education disturbing. There are people here screwing up even basics like F=MA and the difference between acceleration and velocity. Come on guys, you're smarter than that.
Edited by Phaedrus2129 - 5/23/12 at 8:09am
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post #58 of 163
5/23/12 at 8:07am
Quote:
Originally Posted by fivestring View Post

Not if the outer wall of the capsule is intact after the collision. And the amount of water may not have to add alot of weight. I have never personally experimented with this but, I've seen seen where an egg was put in a centrifuge. First without a liquid buffer and it crussed it at around 5gs. Second time the egg in a Pyrex cylinder filled with water and egg just placed within. The egg lasted to beyond the safe limits of the centifuge.

That is because the object it's self was in a liquid, which spreads the G forces out equally. Remember, there is a liquid inside the egg, so if you have a liquid outside under the same pressures, it won't crack.

Each individual passenger would have to be in it's own water capsule for this to work.

Plus, this wouldn't help in an impact. If you took that same egg in water and dropped it, it would still shatter as soon as it hit the bottom of the container.
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post #59 of 163
5/23/12 at 8:16am
i was about to say what Phaedrus and sector9 said. good save guys lol .im surprised the conversation wen ton that long tongue.gif

if that capsule came to a sudden stop, the people inside the inner capsule would be splattered against the walls. biggrin.gif
...but can it run crysis?
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...but can it run crysis?
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post #60 of 163
5/23/12 at 8:25am
Quote:
Originally Posted by banded1 View Post

i was about to say what Phaedrus and sector9 said. good save guys lol .im surprised the conversation wen ton that long tongue.gif
if that capsule came to a sudden stop, the people inside the inner capsule would be splattered against the walls. biggrin.gif

True, but such a system could mean the difference between having to replace a costly capsule and sending in an $8.00/hour janitorial crew with a water hose.
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