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[io9] Real-life Futurama tube-transport will catapult you from New York to Beijing in 2 hours - Page 8

post #71 of 163
5/23/12 at 11:14am
  • GingerJohn
  • The trick to flying is to fall and miss the ground
One thing they could do in the event of an emergency is vent the tubes to atmosphere. That would do two things:

1. It would remove the risk of instant asphyxiation from the vacuum of the tube.
2. It would slow the cars down dramatically without relying on electro mechanical breaks.

Obviously you would need to design the cars to be able to withstand the sudden heat and deceleration, and it would not be too much fun for the passengers, but it might help them survive.

I really want to see this become a reality in my lifetime.
Edited by GingerJohn - 5/23/12 at 11:44am
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post #72 of 163
5/23/12 at 11:43am
Quote:
Originally Posted by GingerJohn View Post

One thing they could do in the event of an emergency is vent the tubes to atmosphere. That would do two things:
1. It would remove the risk of instant asphyxiation from the vacuum of the tube.
2. It would slow the cars down dramatically without relying on mechanical breaks.
Obviously you would need to design the cars to be able to withstand the sudden heat and deceleration, and it would not be too much fun for the passengers, but it might help them survive.
I really want to see this become a reality in my lifetime.

It would be maglev so there won't be any need for mechanical breaks anyway tongue.gif
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post #73 of 163
5/23/12 at 11:45am
  • GingerJohn
  • The trick to flying is to fall and miss the ground
Quote:
Originally Posted by andrews2547 View Post

It would be maglev so there won't be any need for mechanical breaks anyway tongue.gif

I meant electro mechanical...
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post #74 of 163
5/23/12 at 11:53am
Quote:
Originally Posted by Aparition View Post

Saftey seems like an issue. One way tubes launching super fast cylinders. Also heck of a wait time, 1 ride every 30+ minutes.

There would be no such wait time.

I'd expect a new transport to be-pushed int the tube shortly after the first had reached full speed (allowing just enough time to stop them all without a collision if there were problems). Probably at least a few dozen in the tube at once on a trans-pacific run.
Quote:
Originally Posted by GingerJohn View Post

One thing they could do in the event of an emergency is vent the tubes to atmosphere. That would do two things:
1. It would remove the risk of instant asphyxiation from the vacuum of the tube.
2. It would slow the cars down dramatically without relying on electro mechanical breaks.
Obviously you would need to design the cars to be able to withstand the sudden heat and deceleration, and it would not be too much fun for the passengers, but it might help them survive.
I really want to see this become a reality in my lifetime.

The containers only weigh 400 pounds each (empty). If there was large breach, I'd expect collision with air at normal pressure to completely destroy one. Rapid venting of the tube would be a very bad idea. They aren't remotely aerodynamic, so it would be like crashing into a brick wall.
Edited by Blameless - 5/23/12 at 11:55am
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post #75 of 163
5/23/12 at 12:11pm
  • GingerJohn
  • The trick to flying is to fall and miss the ground
Quote:
Originally Posted by Blameless View Post

The containers only weigh 400 pounds each (empty). If there was large breach, I'd expect collision with air at normal pressure to completely destroy one. Rapid venting of the tube would be a very bad idea. They aren't remotely aerodynamic, so it would be like crashing into a brick wall.

Hence why I said they would have to be designed to withstand it.

It might not be as bad as you think - short of the tube shearing the capsule will never hit normal pressure at full speed. There will be an area of mounting pressure first, which will help with deceleration.

A light conical nose cone would possibly be sufficient; even at 4,000mph a weak atmosphere is not all that much of a barrier. Just for comparison the shuttle starts to enter atmosphere at ~18,000 mph. These capsules would slow down very quickly, therefore the heating would be very much a transient problem (no need for heat shielding).

The emergency venting I was suggesting would not be instant, rather bleed air into the tube at discrete intervals (such as where your vacuum pumps are located) with a view to getting a breathable atmosphere within, say, 1.5-2 minutes (quick enough to make it a survivable event).

That, coupled with electro mechanical and / or mechanical breaks, would bring the cabin to a stop very quickly and minimise the risk of asphyxiation in the case of a cabin wall breaching.

Edit: Grammar
Edited by GingerJohn - 5/23/12 at 12:18pm
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post #76 of 163
5/23/12 at 12:13pm
If we had not already put a man on the moon and countless Shuttle missions, I would bet some in this same crowd would say 17,000+ MPH for a spacecraft with people on board would be impossible and say it with conviction. Think about it.

Also a good view is the TED talk by DARPA
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Darpa's Director Regina Dugan - "It's understood that for us to have those really big wins, we're going to have failures as part of that. Failure isn't the problem. It's the fear of failure that's the limiting factor there. We have to push through. We say at Darpa, you can't lose your nerve for the big failure, because the nerve you need for the big success is the exact same nerve—until the moment you know which one it's going to be. Not before."

TED Source
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post #77 of 163
5/23/12 at 12:15pm
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Quote:
Originally Posted by Ghoxt View Post

If we had not already put a man on the moon and countless Shuttle missions, I would bet some in this same crowd would say 17,000+ MPH for a spacecraft with people on board would be impossible and say it with conviction. Think about it.
Also a good view is the TED talk by DARPA
Quote:
Darpa's Director Regina Dugan - "It's understood that for us to have those really big wins, we're going to have failures as part of that. Failure isn't the problem. It's the fear of failure that's the limiting factor there. We have to push through. We say at Darpa, you can't lose your nerve for the big failure, because the nerve you need for the big success is the exact same nerve—until the moment you know which one it's going to be. Not before."
TED Source
Speed means nothing without a point of reference. I can say i am going 1 Billion MPH in reference to Planet X.
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post #78 of 163
5/23/12 at 12:27pm
I can see how removing air resistance as a factor would help greatly increase speeds, plus no sonic booms AND you can make your capsule any shape because no aerodynamics needed!

.....but 4000 mph?? No way! It would take forever just to accelerate to that speed without exerting an uncomfortable amount of G's on the passengers, so it makes me think that either the 4000mph is wrong OR there's no way normal passengers will be allowed on this.
Edited by Tippy - 5/23/12 at 12:30pm
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post #79 of 163
5/23/12 at 12:32pm
Quote:
Originally Posted by Tippy View Post

I can see how removing air resistance as a factor would help greatly increase speeds, plus no sonic booms AND you can make your capsule any shape because no aerodynamics needed!
.....but 4000 mph?? No way! It would take forever just to accelerate to that speed without exerting an uncomfortable amount of G's on the passengers, so it makes me think that either the 4000mph is wrong OR there's no way normal passengers will be allowed on this.

Someone in this thread already worked out that to get to 4000MPH with a comfortable amount of Gs should take around 3 mins IIRC. I can't be bothered to look though this thread for that.
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post #80 of 163
5/23/12 at 1:14pm
Again ,The space shuttle travelled in excess of 17,000 MPH...FACT. So 4000+ in a controlled evacuated tube is not so far fetched.
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Neosys
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Overclock.net › Forums › Industry News › Technology and Science News › [io9] Real-life Futurama tube-transport will catapult you from New York to Beijing in 2 hours