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Date: Mon, 31 Dec 2001 12:22:09 -0500
To: <lancair.list@olsusa.com>
From: "Lorn H. Olsen" <lorn@dynacomm.ws>
Subject: Re: Questions on Lancair IV performance
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Reply-To: lancair.list@olsusa.com

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>Date: Sun, 30 Dec 2001 19:59:01 +0800
>From: "Fred Moreno" <FredMoreno@bigpond.com>
>
>Carl Cadwell posted the following:
>
>"My TAS
>speeds at various altitudes are:
>9000 209 kts
>18000 234 kts
>21000 246 kts
>25000 264 kts"
>.
>.
>.
>Since Carl used GPS data and made three speed runs in three directions
>at the same altitude, I assume that the readings he obtained represent
>pretty good data.
>
>Fred Moreno

Being a Mathematician(Actuary) by education, I spent some time 
looking at http://www.reacomp.com/true_airspeed/index.html to verify 
that the formulae were correct. I initially misinterpreted the 
concept.

With todays equipment, what I would like to do to measure speed would 
be to travel in 3 orthogonal(perpendicular) directions using my GPS 
to maintain course and engine power, verified by the airspeed 
indicator, to maintain speed. In the article at the above websight, 
this technique is covered under "Background" and is listed as the 
David Fox method. This is NOT the method that is used to fill in the 
numbers on the web sight. Magnetic heading and not true course need 
to be used in order to use the websight boxes to calculate the true 
air speed.

My comments are to Carl. Carl, did you use the heading as stated in 
the websight? If not, we can still use your data with the formulae in 
the "Background" section to calculate the speeds.
-- 
Lorn H. 'Feathers' Olsen, DynaComm, Corp.
248-478-4301, lorn@dynacomm.ws
LNC2, O-320, N31161, Y47, SE Michigan
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