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View Diary: Elon Musk Unveils Hyperloop Ultra-Rapid-Transit Conceptual Work (247 comments)

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  •  It is *not* the pressure approximating that (0+ / 0-)

    of a particle accelerator.  It's about 1/1000th (about 0.1 kPa) the pressure on earth.  It is not a hard vaccuum.  It's nothing like space.  It's nothing like a particle accelerator.  

    The tube has a cross-sectional area of about 35 thousand square centimeters.  The air cushion under the skis has a cross-sectional area of a few square centimeters and the pressure only needs to reach 9.4 kPa.  That is, it only needs to be 100 times the density of the average air, yet has a cross section 1/10000th of the total.  Only about 1% of the air needs to go under the skis.   It is simply not a problem to get the required pressure under the ski, period.

    Já þýðir já. Nei þýðir nei. Hvað er svona erfitt við það?

    by Rei on Wed Aug 14, 2013 at 08:01:19 AM PDT

    [ Parent ]

    •  if It isn't a problem (0+ / 0-)

      then why don't we see pad-based lifts for moving cargo around a ship or warehouse?  it would be so much easier to simply put 16lb psia under a few pads to lift and move around a 5,000 lb shipping container.  if it only takes .44 lb per second of air per pad, that isn't a problem at all is it?

      I don't think you are grasping what I am saying.

      what I am saying is that it will likely take about 50 times as much air as the paper says it will.  that this air is going into the tube at 5X the calculation that I am showing you for a single car.  That this will be happening almost 24/7.

      that the difficulty with using air in a vacuum tube is so much greater than a maglev that it makes it untenable.

      do you have a clue why a maglev wasn't proposed as the original document says?  

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