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| The Hyperloop: BUSTED |
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| wraper:
Junctions for thermal expansion compensation are completely possible. They need to hold only 1 bar of pressure, therefore could be made even from soft polymer. |
| hayatepilot:
--- Quote from: nctnico on January 16, 2018, 11:16:48 am --- --- Quote from: EEVblog on January 16, 2018, 10:36:55 am --- --- Quote from: nctnico on January 16, 2018, 10:10:13 am ---Since some revived this old thread I watched the video in the first post. I find it cringeworthy. Commercial airliners are made of aluminium composite material and they deal with similar pressures safely so why is that suddenly a problem for the hyperloop? --- End quote --- I'm not a mechanical engineer, yet I can think of many show-stopper problems and why this comparison with planes is not meaningful. --- End quote --- The airplane is just an example of a pressure vessel made as light as possible and yet it withstands similar pressure differences like the hyperloop is supposed to do. Actually an oil or gas pipeline is pretty much comparable to the build scale of a hyperloop tube (and oil and gas pipeline use much higher pressures). It is not like they are building something completely new. For once don't ignore the fact a lot of very smart people are working on building hyperloops allover the world and have working prototypes. Now it all comes down to whether it makes sense economically or not (which intrinsically means getting it safe to operate). --- End quote --- The problem with the pressure difference is not with the pod but with the tube! It is very important whether the pressure differential is positive or negative. If you have a vacuum inside a tube the walls must be very thick to prevent buckling. And if the tube gets kinked enough then the whole tube collapses in on itself. If the pressure is on the inside then the tube can withstand much higher pressure differentials. |
| nctnico:
Still it is not undoable. My point is that all these 'debunking', 'busted', etc videos about big projects are just scaremongering, FUD and fake news (as it is called nowadays). IMHO a video which goes into the technical challenges and possible solutions is much more interesting. I hate the 'can't do /can't be done' attitude because it stops progress. FFS people have walked on the moon so how hard can it be to run a pod through a vacuum tube? Try it at least! |
| ebastler:
--- Quote from: hayatepilot on January 16, 2018, 01:53:15 pm ---The problem with the pressure difference is not with the pod but with the tube! It is very important whether the pressure differential is positive or negative. If you have a vacuum inside a tube the walls must be very thick to prevent buckling. And if the tube gets kinked enough then the whole tube collapses in on itself. If the pressure is on the inside then the tube can withstand much higher pressure differentials. --- End quote --- OK, I'll offer submarines as an example then. Correct direction of the pressure differential there. Yes, they are built much sturdier than airplanes, and are rather short for a hyperloop tube... But they also withstand quite a bit more pressure than one atmoshpere. |
| jonovid:
this 285 mph - 500km/h japanese maglev train looks like a lot safer way to travel. as for Hyper loop until we see a full working prototype that elon musk himself must ride, addressing all safety concerns. Hyperloop will remain a billionaires toy train set. |
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