REFLECTOR: Air pressure question...

[Sid Knox]

You may be confused but you are also correct...  My pitot pressure value was for "standard conditions".  I realize now that this did not answer your question about pitot pressure at 20,000 ft.
Maybe (I am guessing here)  at 20,000 ft since the absolute pressure is only 

6.67 / 14.5   x 100    =  46% of sea-level, then perhaps the pitot pressure would be decresaed by the same percentage.

1.45 psi x .46  =  0.667 psi.              

However, then there is the non-standard temperature at 20,000 ft that may enter in???   Would the E6B help here??

Sid

----- Original Message ----- 
From: "Richard Riley" <richard at riley.net>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Friday, June 17, 2005 10:48 AM
Subject: Re: REFLECTOR: Air pressure question...


> OK, now I'm really confused.
> 
> The only email I have from Sid on this topic reads:
> ===================
> 6.76 psi at 20,000 ft
> 
> from humeno at microsoft.com>
> To: "Velocity Aircraft Owners and Builders list" 
> <http://www.tvbf.org/mailman/listinfo/reflector
> >
> > Visit the gallery! www.tvbf.org/pipermail
> > Check old archives:
> ===================
> 
> and that's all.  Did I miss one?
> 
> 
> 
> At 08:33 AM 6/17/05, you wrote:
>>No, Sid gave the formula to calculate the pitot pressure at any alltitude.
>>
>>Neal posted a chart of the static pressure at different altitudes..
>>
>>Put them together and your free to calculate any Q at any airspeed at any 
>>altitude.
>>
>>Scott
> 
> 
> do not archive
> 
> 
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