This note is to add one point to the discussion on rudder-elevator
flying.
There is a tendency for R/E models to pitch up when a turn is
initiated due to gyroscopic precession. The rudder initiates a yaw
rate, giving a yaw angle. This angle couples with the wing's
dihedral angle to create a rolling moment. The rolling moment acts
on the yaw rate and tends to pitch the airplane up due to gyroscopic
precession. Most experienced R/E pilots compensate at the beginning
of the turn with a little down elevator, but I don't think they know
they are doing it. (This is one reason why aileron airplanes feel
weird at first to a R/E pilot.)
Home experiment: Take the front wheel off your bike. Hold it in
front of you so the axle is vertical. Spin the wheel to the left
(counterclockwise). Gently attempt to roll the wheel to the left.
You will see that it tends to pitch up.
The effect on rolling out of the turn is less pronounced because the
yaw rate of the turn is reduced by the rolling-out rudder input.
That's all for now.
Blaine Beron-Rawdon
Envision Design
San Pedro, CA
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