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In Hyperloop air bearings, the air escapes through the rear cross-sectional area of each ski, you know? Yes, there is a pressure differential, but the air comes out of the skis, crashes into the tube and then is accelerated to a certain speed below 760 mph/1,220 kph and escape. The air cannot escape through the front cross-sectional area because of the ski high speed and for the same reason they cannot escape through the lateral areas (well, there will be some minor leaks). That's Couette-Poiseuille flow.

So the mass flow is rhoAc

Where c is the speed the air is accelerated to, rho is the density, and A the rear cross-sectional area.

What do you think?

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  • $\begingroup$ Nobody has yet solved the problem of how to make a viable air bearing this size, especially considering that the air gap on an air bearing is only a few microns and must be accurately polished $\endgroup$ – Tony Stewart Sunnyskyguy EE75 Apr 22 '19 at 16:23
  • $\begingroup$ Do you think it would be possible to solve this problem? $\endgroup$ – user20096 Apr 22 '19 at 17:35
  • $\begingroup$ not with air alone. due to surface roughness $\endgroup$ – Tony Stewart Sunnyskyguy EE75 Apr 22 '19 at 17:42
  • $\begingroup$ The tube internal wall can be polished as much as you want. Air bearings are a cheap solution for Hyperloop. $\endgroup$ – user20096 Apr 22 '19 at 20:17
  • $\begingroup$ to what coplanarity? um/km $\endgroup$ – Tony Stewart Sunnyskyguy EE75 Apr 22 '19 at 20:36

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