8 ms·Isn't it true that you can never generate a supersonic projectile with just air pressure?by knodi123 2mo agoIsn't it true that you can never generate a supersonic projectile with just air pressure?mnw21cam 2mo agoI don't believe that is true - rockets produce a very supersonic airflow from gas pressure.knodi123 1mo agoI looked into it. Yes, you're correct, I was wrong. Although there is a speed limit of mach 5 (theoretical, not reachable in practice!) for shockwaves in normal atmosphere.