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In a message dated 1/14/2003 7:58:34 PM Central Standard Time, marv@lancaironline.net writes:
Don't forget about the pitching moment about the MAC. Cm is fairly
small for our airfoil (-.05) and the reflex will reduce it further but
it still amounts to a significant down force requirement for the tail.
Chris,
Yeah, I talked to Jack Webb today. There are many variables. But, let us not forget that the engine is pitched up a bit and there is some fuselage effect since my cowl and canopy want to be badly sucked upwards. All I know is that the faster I go, the more I must trim nose down, not nose up.
I built a tube and fabric (Quad Cities Challenger II, sold long ago) with flaperons. I used a linear motor to operate the "flap" part of the flaperons. This became the pitch trim - no tab on the elevator.
Luckily, the rear seat passenger, if any, sat on the middle of the CG range. If I think about it hard enough, trim via reflexing the flap may not be the best idea since the tail is being unloaded. Speed via drag reduction was not a consideration. Oh, my head is starting to hurt.
Scott Krueger
N92EX
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