2.11. Adverse Yaw

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2.11.1. Adverse yaw is the tendency of the aircraft to yaw away from direction of aileron input. Increased lift on the up-going wing causes more induced drag, which retards forward movement of that wing. This results in the nose yawing or turning opposite the direction of the roll.

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2.11.2. Adverse yaw is overcome by rudder use. As aileron pressure is applied, simultaneously apply rudder pressure in the same direction as the desired turn. Use rudder pressure as long as the bank is changing. The correct amount of rudder pressure depends on the aircraft speed and the amount of aileron deflection. To ensure the proper amount of rudder is used, cross-check the turn and slip indicator and attempt to keep the ball centered. “Step on the ball”. This means to push on the rudder that is on the same side of centerline as the ball to put the ball back in the middle of the turn and slip indicator. Apply rudder and aileron pressure simultaneously, although the required amount of pressure differs depending on the amount of aileron used, airspeed, effect of drag, and aircraft design. Aileron drag effect is present during recovery from a turn as well as during the entry. The rudder must be used in the same direction as aileron control stick pressure to counteract adverse yaw in the rollout.

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