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A comment on Hyperloop: riding sound’s density peak to exploit the drag equation?. Parent comment
And you don't want low pressure, but high, so the air speed is low. Drag is proportional to the density, but proportional to the square of the speed.
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And you don't want low pressure, but high, so the air speed is low. Drag is proportional to the density, but proportional to the square of the speed.