Chapter 14 Flow round bodies moving at supersonic speed

It weighed about 10 kg or 22 pounds and the electrical input to the motor that drove the airscrew was about 70 watts. ... by definition, in that shock wave, the speed drops from supersonic to subsonic, the pressure and temperature both rise and, not least, energy is lost. ... By comparison some bullets have flattened noses and these produce a ... ................
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