From: muratlanne@gmail.com   
      
   "Bob La Londe"  wrote in message news:vpb6or$3kr8r$1@dont-email.me...   
      
   Getting into pneumatics, with natural nitrogen oxygen "air" there is a   
   velocity limitation, but it might be faster than you might think.   
      
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   I understand Mach 1 being a "choked" flow speed limit since it's the   
   temperature but not pressure dependent average speed of the individual air   
   molecules. Lighter molecules like Helium move faster to have the same   
   kinetic energy at the same temperature, heavy CO2 moves slower. Going beyond   
   with DeLaval nozzles etc is beyond my slim knowledge of fluid dynamics   
   (rocket science).   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)