Consider statements about adverse yaw: P: it is caused by flow separation over the rudder. Q: it is caused by unequal wing drag when ailerons are deflected by equal magnitudes. R: it can be reduced by making upward aileron deflection greater than downward deflection. Which are correct?
Ailerons change the lift and drag of the two wings differently. The more heavily lifting wing can develop greater induced drag, yawing the aircraft opposite the commanded roll. Differential ailerons reduce this imbalance by using more upward than downward deflection. Hence Q and R are correct, D; rudder separation is not the defining mechanism.
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