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I am back in town after the holidays and catching up on the Lancair
posts.
Answers to questions about my previous post:
>"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
Lorn H. 'Feathers' Olsen, DynaComm, Corp. further commented:
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.

The answer is that I flew three consecutive orthogonal directions using
GPS headings (true course) and not the magnetic headings.

When I stated the TCM indicated that LOP operation should only be below
65%, George Braly of Gami asked:  Who, precisely, at TCM told you this?
I don't recall the 2 names, both were from engineering and attended the
Lancair banquet.

George Braly further asked:  The right question to ask is, while leaning
the engine from rich to lean of peak:  What is the fuel flow when the
first cylinder peaks  and what is the fuel flow when the last cylinder
hits its peak EGT?  18.6 to 18.0 gph is the spread of fuel flows for the
peak temperature.  I did use the GAMI spreadsheet.  5 cylinders were
clustered around 18.4 gph.

My thanks to Fred, Loren "Feathers" and George for their additional
insights.

Carl Cadwell
N25CL IVP
Out flying today for lunch -my plane is hangered 50 feet out the back
door of my office - gorgeous here in the NW!  From 5000 ft in E.
Washignton I could see the Northern Cascades , Mr. Rainier, Mt Adams,
Mt. St. Helens and Mt. Jefferson.  Shot 3 solid approaches by hand.
Easy!  What a great plane!
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