What is the effect known as torque effect?

The torque effect refers to the aircraft's tendency to roll in the opposite direction of the engine's rotation. This phenomenon is a result of Newton's third law of motion, where every action has an equal and opposite reaction. In the case of a propeller-driven aircraft like the T-6A, as the propeller spins in one direction, the airframe experiences a reactive force that tends to roll it in the opposite direction.

For example, if the propeller rotates clockwise, the aircraft may want to roll to the left due to this torque effect. This is particularly noticeable during takeoff and when climbing, as the effects of engine power are most pronounced during these phases of flight. Understanding the torque effect is crucial for pilots, as it requires them to apply the appropriate amount of opposite control input to maintain level flight and prevent uncommanded rolling motions.

The other choices do not capture the essence of the torque effect. The increase of induced drag relates to lift, the change in flight path due to propeller slipstream pertains to how the airflow affects control surfaces, and the alteration of airflow caused by a moving aileron addresses a different aspect of aerodynamic control.