In an aileron system, what does differential control mean?

Differential control in an aileron system refers to the design where the upward travel of the aileron is greater than the downward travel. This design helps to counteract adverse yaw, a tendency for the aircraft to yaw away from the direction of a turn when one aileron moves down and increases drag on that wing. By allowing the aileron that goes up to travel further, it reduces the drag on that side while providing enough lift to maintain roll control.

This difference in movement ensures smoother and more coordinated turns, enhancing the aircraft's handling characteristics. In practical terms, when a pilot inputs a command to roll the aircraft, the ailerons respond in a way that benefits overall control and stability, reducing the tendency to yaw opposite to the desired turn direction.