Wing twist is a design feature incorporated into some wings to improve what?

• A. Lift during takeoff
• B. Drag reduction at cruise
• C. Structural strength at high speeds
• D. Aileron control effectiveness at high angles of attack during an approach to a stall

Answer: (D)

Wing twist (washout) is built to shape how the wing stalls. By reducing the angle of incidence from the root to the tip, the root reaches the critical angle of attack first and stalls before the outer wing. This keeps the ailerons effective longer as you approach a stall, preserving roll control when you most need it. So the design feature mainly improves aileron control effectiveness at high angles of attack during an approach to a stall. It’s not primarily about lift for takeoff, drag in cruise, or structural strength.