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[io9] Real-life Futurama tube-transport will catapult you from New York to Beijing in 2 hours - Page 4

post #31 of 163
People, 1 G is the equivalent of zero acceleration/deceleration. They mean that, at top speed you don't feel any different than like standing still.
post #32 of 163
Quote:
Originally Posted by xeekei View Post

People, 1 G is the equivalent of zero acceleration/deceleration. They mean that, at top speed you don't feel any different than like standing still.

lol this.

What is a G? Ohyahthatsright, one earth gravity.

How many of those do we have here on earth. Oyah, 1 of demz.

Where do we all live? Yep is earth.
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post #33 of 163
Quote:
Originally Posted by andrews2547 View Post

No, because if that was true then going 600mph (the same speed as a Boeing 747) then that would mean there would be 300G (assuming "less than 1G" is 0.5G) The amount of G-force has nothing to do with how fast you're going, it's all about acceleration, deceleration and cornering.
Did this kid even read my post? doh.gif
Quote:
Originally Posted by Warmonger View Post

Keep in mind G force is not from going high speeds, its from extreme fast acceleration.
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post #34 of 163
Quote:
Originally Posted by un-nefer View Post

Saw this on discovery years ago:
http://www.youtube.com/watch?v=EapvQ3ALYJY
Only the first min is on topic - the gravity train stuff after it is wayyyyy ot tongue.gif
EDIT: Just on the possibility side of things, can someone good at maths compute this for me tongue.gif
The distance between New York and Beijing is approx 7,000 miles.
Max speed "tube transport" can travel = 4000mph
Approx weight of "tube transport" = 600kg (assuming similar weight to an F1 carbon fiber race car)
Max positive Gs an average person can withstand* = 3G (28 m/s²) for 10sec.
Max negative Gs an average person can withstand* = 2G (−19 m/s²) for 10sec.
So using those parameters above, and not going above 3G for longer than 10 seconds during acceleration, how long would it take the "tube transport" to accelerate from 0mph to 4000mph?
Also, using those parameters above, and not going below -2G for longer than 10 seconds during deceleration, how long would it take the "tube transport" to decelerate from 4000mph to 0mph?
While it may be theoretically possible for the capsule to reach 4000mph and travel between New York and Beijing in 45min, I am curious as to whther it is possible once you factor in human ability to withstand certain Gs before health risks set in.
If someone good at maths can do the above calculations, it would be good to see just how long it would really take to travel between New York and Beijing and keep the humans inside the "tube transport" alive and unhurt smile.gif
* some people may be able to withstand upto 5G before losing consciousness or -3G before redout, but that does not make it safe for public use. +/- 2G is about the most an average person can withstand repeatedly.

Alright, I've calculated this out.

Assuming that 1G = an acceleration of 9.8m/s/s, then the acceleration phase, if we use 3G's of acceleration, would take approx. 60 seconds and cover 52920 meters as it does so. It's then smooth sailing until the destination, which would require 90 seconds to slow down. The distances and times of the acceleration and deceleration are essentially negligable.

Remember, it's acceleration that is a danger to humans. Velocity is not. You could go 9000 mph in a tube with no problems. It's just getting up to that speed or from that speed to zero in a short amount of time that is a problem.... thumb.gif
 
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post #35 of 163
Quote:
Originally Posted by coachmark2 View Post

Alright, I've calculated this out.
Assuming that 1G = an acceleration of 9.8m/s/s, then the acceleration phase, if we use 3G's of acceleration, would take approx. 60 seconds and cover 52920 meters as it does so. It's then smooth sailing until the destination, which would require 90 seconds to slow down. The distances and times of the acceleration and deceleration are essentially negligable.
Remember, it's acceleration that is a danger to humans. Velocity is not. You could go 9000 mph in a tube with no problems. It's just getting up to that speed or from that speed to zero in a short amount of time that is a problem.... thumb.gif
To add to that we all are moving at over 1000 MPH right this very second. The earth spins at around 1,038 MPH every second of the day. Tho to us it feels like nothing because the speed has been constant since the beginning of time. So if speed could kill you, we all would be already dead.
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post #36 of 163
Quote:
Originally Posted by Darkpriest667 View Post

cheaper to run and build than high speed rail. its also much more efficient. I think it would be cheaper than flying actually

May be the case, except it's far less efficient (as presented) for mass travel. You can pack 800+ people in a trans-oceanic flight, but I wonder how many people you can transport at a time with this tech. If it's only like 10 at a time and you can't multiplex the tube usage very easily then it's not a great choice--if you need to build 80 tubes to match the simultaneous capacity of one plane, then where does the cost fit in?

I'm curious--being 1/10 the cost of trains, does that break down to cost per passenger being less to operate too? Transporting 6-8 people at a time, how many pods can you pack into a tube at a time for a single destination? If it's 1/10 of the total people that can be transported on a high-speed rail, I'm not seeing the benefit.

I think it's an interesting idea, but there seem to still be a lot of physical and/or practical limitations to its use/adoption. Either that, or I'm not quite getting enough info from the video.
    
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post #37 of 163
hmm 11000 km from newyork to beijing. I dont think anyone would appreciate sitting in a tube for 2 hours watching the world wiz by at 5000km/h it would be almost sickening. But I hope to see this thing perfected.
post #38 of 163
Quote:
Originally Posted by guyladouche View Post

May be the case, except it's far less efficient (as presented) for mass travel. You can pack 800+ people in a trans-oceanic flight, but I wonder how many people you can transport at a time with this tech. If it's only like 10 at a time and you can't multiplex the tube usage very easily then it's not a great choice--if you need to build 80 tubes to match the simultaneous capacity of one plane, then where does the cost fit in?
I'm curious--being 1/10 the cost of trains, does that break down to cost per passenger being less to operate too? Transporting 6-8 people at a time, how many pods can you pack into a tube at a time for a single destination? If it's 1/10 of the total people that can be transported on a high-speed rail, I'm not seeing the benefit.
I think it's an interesting idea, but there seem to still be a lot of physical and/or practical limitations to its use/adoption. Either that, or I'm not quite getting enough info from the video.

Even at a low volume, it would still be a worthy pursuit. The ability to quickly and effectively move an object long distances is something that we still don't really have. Even at an absurd price premium, this service would have business.
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post #39 of 163
Quote:
Originally Posted by BizzareRide View Post

G force = sudden death?

Acceleration would be kept low.
Quote:
Originally Posted by un-nefer View Post

While it may be theoretically possible for the capsule to reach 4000mph and travel between New York and Beijing in 45min, I am curious as to whther it is possible once you factor in human ability to withstand certain Gs before health risks set in.
If someone good at maths can do the above calculations, it would be good to see just how long it would really take to travel between New York and Beijing and keep the humans inside the "tube transport" alive and unhurt smile.gif
* some people may be able to withstand upto 5G before losing consciousness or -3G before redout, but that does not make it safe for public use. +/- 2G is about the most an average person can withstand repeatedly.

Even a paltry 1G of acceleration can get you to 4,000mph, or bring you back down to zero, in a fairly short period of time.

4,000 mph is ~1788 m/s. It would only take three minutes at 1G acceleration to reach this speed.
Quote:
Originally Posted by xeekei View Post

People, 1 G is the equivalent of zero acceleration/deceleration. They mean that, at top speed you don't feel any different than like standing still.

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.
Quote:
Originally Posted by guyladouche View Post

May be the case, except it's far less efficient (as presented) for mass travel. You can pack 800+ people in a trans-oceanic flight, but I wonder how many people you can transport at a time with this tech.

A lot of of these transports will fit in a 7,000 mile long tube with a lot of space between them.
post #40 of 163
Quote:
Originally Posted by guyladouche View Post

May be the case, except it's far less efficient (as presented) for mass travel. You can pack 800+ people in a trans-oceanic flight, but I wonder how many people you can transport at a time with this tech. If it's only like 10 at a time and you can't multiplex the tube usage very easily then it's not a great choice--if you need to build 80 tubes to match the simultaneous capacity of one plane, then where does the cost fit in?
I'm curious--being 1/10 the cost of trains, does that break down to cost per passenger being less to operate too? Transporting 6-8 people at a time, how many pods can you pack into a tube at a time for a single destination? If it's 1/10 of the total people that can be transported on a high-speed rail, I'm not seeing the benefit.
I think it's an interesting idea, but there seem to still be a lot of physical and/or practical limitations to its use/adoption. Either that, or I'm not quite getting enough info from the video.
I'm sure they would only use this technology for long distance travel. That alone would cut the demand for them down greatly. Also even if one container can hold 10 people, that's still not that bad. The idea is instead of sending one big train with 100+ people on it, just send 10-20 small trains at a faster speed. I am certain each tube can hold more then 10+ containers in it simultaneously. There would only have to be a seal between each container. And different speed stages that each container would have to pass though, so containers just starting out don't get blasted with 4000 MPH speeds.
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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