What does slipstream swirl cause when flying at low airspeeds and high power settings, and how is it corrected?

Slipstream swirl is a phenomenon that occurs primarily at low airspeeds and high power settings, where the spinning motion of the propeller generates a corkscrew effect of airflow that affects the aircraft. This swirling air creates a differential in lift and drag on the wings, particularly because of the direction of rotation of the propeller.

When the T-6A is operating under these conditions, the slipstream typically results in a tendency for the aircraft to yaw to the left. The left yaw is primarily caused by the downward-moving airflow on the left side of the aircraft, which affects the left wing more than the right. To counteract this left yawing motion, pilots apply right rudder pressure. The right rudder counteracts the yaw by helping to keep the aircraft aligned with the desired flight path.

Therefore, understanding this aerodynamic effect enables a pilot to make the appropriate control inputs necessary to maintain stability and control in flight, particularly in critical phases such as takeoff and low-speed maneuvers.