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From: RWolf99@aol.com
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Date: Fri, 6 Oct 2000 11:13:03 EDT
Subject: Re:  Static Ports
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          <<  Lancair Builders' Mail List  >>
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>>

In a message dated 10/5/0 10:24:55 PM, you wrote:

<<I finally used the 
heated pitot, but changed the static to the locations recommended by Lancair 
on both sides of the airplane.  IAS is now accurate and the altimeter is 
accurate and steady. >>

Scott -

The error you are describing is called "position error" and is the difference 
in static pressure at the static port compared to the acutal ambient pressure 
in the air through which the airplane is flying.  I think you know all this.

We (Air Force Flight Test Center) measured this error not by IAS errors, but 
by indicated altitude errors, since a pressure error shows up much bigger on 
the altimeter rather than on the airspeed indicator.  We then used 
mathematical formulas to transform the altitude error into an airspeed error.

Of course, in those days we didn't have GPS for groundspeed measurements....

- Rob Wolf
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