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Message
Hi Rusty,
This performance gap you are seeing is a real
mystery. I can think of no one answer that explains it all so it's
probably a combination of factors. Here's my best
SWAG:
1. The BUC is draggy, even worse than we
thought (but doesn't really explain the lousy climb rate)
2. The Warp Drive prop is never going to be
an optimum high speed stick. (but hell, you're not even to moderate speed
yet) My gut feel is that you should be running at least 17 degrees at
tip. Anything less than 16 is a waste of time unless you are resigned to
flying a draggy RV-3 which I'm sure you are not. This is assuming about a
68 - 69" prop length.
3. Your CG is near the fwd. limit which
generates a LOT of trim drag.
4. You may be underestimating the effect of
gearleg & wheel fairings (I think you mentioned you don't have them
yet) I found that I could not make ANY final decisions on
airframe/engine performance, prop pitch or even cooling until these were in
place.
Turbo stuff:
I have no turbo experience but my best guess is
that the air temp sensor should be up-wind of the turbo. Let the MAP table
programming take care of the temp rise due to adabiatic (Sp?) heating from the
turbo. This should work at low levels of boost like you are running
and will eliminate the big mixture difference between A & B
controllers. With this setup in a worst case scenario, the mixture might
go too rich at high boost, a much better thing than too
lean.
Tracy
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