Hyperloop Technologies

Point out news stories, on the net or in mainstream media, related to polywell fusion.

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choff
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Re: Hyperloop Technologies

Postby choff » Wed Feb 18, 2015 8:55 pm

I'm partial to inductive track maglev trains if they ever build one, competitive costwise with conventional freight. Have to live with very expensive skytrain where I live, which, while electric is firmly grounded.
CHoff

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Re: Hyperloop Technologies

Postby GIThruster » Wed Feb 18, 2015 9:01 pm

"Courage is not just a virtue, but the form of every virtue at the testing point." C. S. Lewis

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Re: Hyperloop Technologies

Postby krenshala » Wed Feb 18, 2015 9:19 pm


KitemanSA
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Re: Hyperloop Technologies

Postby KitemanSA » Fri Feb 20, 2015 8:52 pm

Last edited by KitemanSA on Fri Feb 20, 2015 9:07 pm, edited 5 times in total.

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Re: Hyperloop Technologies

Postby KitemanSA » Fri Feb 20, 2015 8:59 pm


AcesHigh
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Re: Hyperloop Technologies

Postby AcesHigh » Sat Feb 21, 2015 8:23 pm

if you have enough space, you can parallel park driving ahead, no need to stop and drive in reverse. And you will still park parallel (because it´s in relation to the curb)

Also, remember there is "oblique parking", where you park in the diagonal. Once again, it´s oblique related to the curb.
Image

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Re: Hyperloop Technologies

Postby DeltaV » Sun Feb 22, 2015 8:38 pm


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Re: Hyperloop Technologies

Postby Scupperer » Sun Mar 01, 2015 12:57 pm



Will be interesting to see if they can deliver and keep it as inexpensive as they believe.
Perrin Ehlinger

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Re: Hyperloop Technologies

Postby cc » Wed Mar 04, 2015 11:23 pm


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Re: Hyperloop Technologies

Postby ladajo » Thu Mar 05, 2015 6:04 pm

It would more than likely play as an economy of scale function. Initial builds, not so much, later and larger builds, more so.
The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)
What I want to do is to look up C. . . . I call him the Forgotten Man. (Sumner)

choff
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Re: Hyperloop Technologies

Postby choff » Fri Mar 06, 2015 8:04 pm

One problem I see with hyperloop, travelling in a vacuum tube, lets say the cabin suddenly springs a leak while underway. By the time the train has slowed down and normalized atmospheric pressure in the tube to a breathable cabin pressure would be how long? Maybe the leak never gets detected until the train arrives in station full of dead people.
CHoff

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Re: Hyperloop Technologies

Postby GIThruster » Fri Mar 06, 2015 8:35 pm

The air isn't evacuated so much as moving. It's the air that moves the cars. The trouble is in moving air supersonically without dissipating all your energy in turbulence and shock wave generation. And if they get a standing shockwave, kiss the tunnel good-by.
"Courage is not just a virtue, but the form of every virtue at the testing point." C. S. Lewis

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Re: Hyperloop Technologies

Postby raelik » Fri Mar 06, 2015 10:51 pm

Doing a back-of-the-envelope calculation, to achieve laminar flow (a Reynolds Number less than 2300) in, let's say a 10 ft. diameter tube at 60 deg. F, with the air moving at 760 mph, would require the air to be evacuated down to about 25 milliTorr, which is a fairly substantial vacuum, but not outside the realm of possibility. Of course, 10 ft. diameter is probably not realistic except in a prototype demonstrator. A larger diameter is probably going to be necessary for a commuter car, though maybe not by much since the car would need to essentially seal the tunnel. A larger diameter will require more vacuum for the flow to stay laminar. This also assumes that the tunnel is as perfectly smooth as possible, and that the front and back of the car have the correct geometry to avoid establishing vortices.

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Re: Hyperloop Technologies

Postby erblo » Sun Mar 08, 2015 11:31 am


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Re: Hyperloop Technologies

Postby Aero » Sun Mar 08, 2015 3:48 pm

Since we're talking about emergency pressurization scenarios, what happens if a car is speeding along and an earth quake or some other disaster rips the tube completely apart some few miles ahead of the car? The air will rush in, the speeding car will slam into the inrushing air and quickly decelerate. What level of deceleration would that be. Would it amount to hitting a brick wall, or hitting a water surface from 3 feet - 10 feet - 100 feet altitude?

In this scenario, the relative air speed at near atmospheric pressure would be supersonic.
Aero


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