The purpose of having both inboard and outboard ailerons is to:

• A. Increase lift at low speeds
• B. Prevent wing twist at high speeds
• C. Improve roll rate at stall
• D. Reduce flutter at cruise

Answer: (B)

When you roll the airplane, the wing’s shape tends to twist due to the lift changes and the wing’s torsional stiffness. At high speeds that twisting can become significant, reducing the effectiveness of the aileron and potentially causing control issues. Having both inboard and outboard ailerons allows the lift change to be shared across more of the wing and coordinated in a way that minimizes this aeroelastic twist. The result is that roll control remains effective at high speeds without the wing twisting enough to degrade performance or cause adverse effects.