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The root cause of the problem was dynamic. Warping the wing did what was expected in terms of lift, thereby rolling the plane, but also had an unexpectedly large effect on drag. The result was that the upward-moving wing was dragged backwards, yawing the glider. If this yaw was violent enough the additional speed on the lower wing as it was driven forward would make it generate more lift, and reverse the direction of the roll.
Another much-slower form of control reversal affected the [[Gossamer Condor]], the [[Kremer_prizes|Kremer Prize]]-winning human-powered airplane. When a wing-warping mechanism was tried as a solution to a long-running turning problem, the effect was to turn the airplane in the opposite direction to that expected by conventional airplane knowledge. When the Condor was rigged "conventionally", the inside wing slowed down so much that it settled to the ground. By employing "backwards" wired wing-warping, the inside wingtip [[angle of attack]] was increased so that the added drag slowed that wing while the added lift allowed the airfoil to stay aloft at a slower speed. The tilted canard could then complete the turn.
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