REFLECTOR: Air pressure question...

[Sid Knox]

6.76 psi  at 20,000 ft

from   http://www.engineeringtoolbox.com/air-altitude-pressure-25_462.html

********************************************
Pitot pressure in inches-of-water is:

P,in H2O = (V, mph) ^2   /  2070

250 kts = 288 mph
288 ^2 / 2070 = 40.1 in H2O

1 in H2O = 0.0361 psi
40.1 x  0.0361 = 1.45 psi


Sid Knox
Oklahoma

Velocity    N199RS
Starduster  N666SK
KR2         N24TC
W7QJQ


----- Original Message ----- 
From: "Hiroo Umeno" <humeno at microsoft.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Thursday, June 16, 2005 8:34 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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