Question

How does the use of differential aileron deflection specifically counteract the aerodynamic phenomenon of adverse yaw?

Accepted Answer

Adverse yaw is the tendency of an aircraft to yaw, or rotate around its vertical axis, in the direction opposite to a roll. This occurs because the downward-deflected aileron, which creates lift to raise a wing, simultaneously creates more induced drag than the upward-deflected aileron on the opposite wing. Differential aileron deflection counteracts this by mechanically linking the ailerons so that the upward-moving aileron deflects through a greater angle than the downward-moving aileron. Because the upward-deflected aileron creates more parasitic drag—the resistance generated by the shape and movement of the wing through the air—as it moves through a larger arc, it balances out the induced drag created by the downward-deflected aileron. By ensuring the drag on both wings is equalized during a roll, the differential aileron system minimizes the yawing moment, allowing the aircraft to maintain a coordinated turn without needing significant rudder input.

Home → All Courses → Engineering and Technology Courses → Aircraft & Flight Fundamentals → Flashcard

How does the use of differential aileron deflection specifically counteract the aerodynamic phenomenon of adverse yaw?

Adverse yaw is the tendency of an aircraft to yaw, or rotate around its vertical axis, in the direction opposite to a roll. This occurs because the downward-deflected aileron, which creates lift to raise a wing, simultaneously creates more induced drag than the upward-deflected aileron on ....