Adverse yaw is primarily caused by differential wing drag during a turn. Which control inputs best counter it?

• A. Apply ailerons only in the direction of the turn.
• B. Increase power to eliminate drag.
• C. Use rudder to keep wings level only.
• D. Use coordinated rudder and aileron to maintain coordinated turn.

Answer: (D)

Coordinated use of rudder and aileron is needed to counter adverse yaw. When you roll into a turn, the wing moving downward deflects the aileron to increase lift there, which also increases drag on that wing. The opposite wing has less lift and drag, so the nose tends to yaw away from the direction of the turn. By applying rudder in the direction you want to turn while maintaining the bank with ailerons, you create a yaw moment that keeps the nose aligned with the turn and makes the turn coordinated. Using only ailerons would leave the yaw uncorrected, and attempting to keep the wings level with rudder alone defeats the roll needed for the turn. Merely increasing power won't reliably fix the adverse yaw, since the problem is about differential drag and yaw, not just thrust.