Discussion
Adverse yaw during a roll arises because
Answer: D
Correct answer: Extra induced drag when lowered
The down-going aileron increases the lift on its wing, and induced drag rises with lift. The up-going aileron reduces lift and induced drag on the other side, so the aeroplane is left with more drag on the wing that is rising.
That drag differential yaws the nose away from the direction of roll - adverse yaw. It is greatest at low speed and high lift coefficient, where induced drag dominates, which is why the effect is most obvious in a slow, steep turn entry and is countered with rudder.
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