What is torque effect? (FAA‑H‑8083‑25)
Torque effect involves Newton’s Third Law of Physics—for every action, there is an equal and opposite reaction. Applied to the airplane, this means that as the internal engine parts and the propeller are revolving in one direction, an equal force is trying to rotate the airplane in the opposite direction. It is greatest when at low airspeeds with high power settings and a high angle of attack.
Torque effect, also known as engine torque reaction, is the tendency of an aircraft’s powerplant to cause the aircraft to yaw or turn in the opposite direction of the rotating propeller due to the engine’s torque. This effect is caused by Newton’s Third Law of Motion which states that every action has an equal and opposite reaction. As the propeller spins clockwise, the engine and airframe react by producing a moment of force in the counterclockwise direction, resulting in a yawing or turning moment on the aircraft.
The amount of torque effect varies depending on the aircraft’s engine power, propeller size, and direction of rotation. To counteract this effect, the pilot must apply rudder input in the direction opposite to the yaw to maintain directional control during takeoff and climb.
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