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Bret,
Model gliders have tried most of these control ideas at least once in the past 20 years. It's much easier with the servos and computer controlled radios to get almost any mixing arrangements you can think of. In the case of the full-span flaperon: Once the flap function exceeds about 25 degrees down, the additional downward deflection of the aileron function does NOT create much lift to make a roll, in fact it adds a lot more drag and really increases the adverse drag. The upward moving aileron function reduces the drag a little, but doesn't remove much lift, again resulting an adverse yaw but no real rolling effect. In the models you can change the "rate" of the controls (increase or decrease the deflection relative to the control stick input) and overcome some of the rolling problems but not very much. We don't have any mechanism in our "big" sailplanes (that I know about) that can increase the deflection of a surface at different airspeeds or by selecting a mechanical detent on a control. Having tried full-span flaperons in the model form, several times, I can say I'd rather not try them on a full size, where my life is on the line. Mike |
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