REFLECTOR: Air pressure question...

[Joe Ewen]

Hiro,
Following is data to 15K
      Alt in hg PSI 
      SL 29.92 14.7 
      1000 28.86 14.2 
      2000 27.82 13.7 
      3000 26.81 13.2 
      4000 25.84 12.7 
      5000 24.9 12.2 
      6000 23.98 11.8 
      7000 23.09 11.3 
      8000 22.23 10.9 
      9000 21.39 10.5 
      10000 20.58 10.1 
      11000 19.8 9.7 
      12000 19.03 9.3 
      13000 18.3 9.0 
      14000 17.58 8.6 
      15000 16.89 8.3 

  ----- Original Message ----- 
  From: Hiroo Umeno 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Thursday, June 16, 2005 9:34 PM
  Subject: REFLECTOR: Air pressure question...


  I am not too up on my physics so I would like to pick the community's collective brains on a little air pressure question.



  The air pressure at sea level is about 14.5psi.  What is the air pressure at, say 20,000ft msl?



  Also, what would be the pressure differential (in PSI) at 250KIAS between Pitot and Static ports?



  Thanks.



  Hiroo



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