Thread: Discussion What won't my Kestrel fly?
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Old Sep 24, 2012, 12:13 AM
kcaldwel is offline
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Tractor propellers are destabilizing in pitch and yaw. It looks to be marginally stable in yaw without the motor running, but perhaps unstable with it on. The motor torque and destabilizing effect of the prop could well be overcoming the little yaw stability it had while gliding, and then adverse yaw from the aileron deflection adds on top of that.

Some slope soaring without the prop would perhaps let you trim it out - any slopes around? Perhaps not in Texas. A light balsa fin might not look great, but perhaps it would help get it flying and then hopefully it could be removed.

Short coupled airplanes usually have more - ah - interesting - flying characteristics! They have a lot less damping, and lower stability, in pitch and yaw. They can be trickier to get flying decently, as you are discovering.

Kevin
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