Which control surface controls movement about the vertical axis?

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Multiple Choice

Which control surface controls movement about the vertical axis?

Explanation:
Movement about the vertical axis is yaw. The rudder, mounted on the vertical stabilizer, is moved left or right to create a side-force that yaws the aircraft. This surface is specifically designed to control motion around the vertical axis, unlike the other surfaces which handle different axes: the elevator controls pitch (nose up or down), the ailerons control roll (wing tips rise or fall), and flaps primarily affect lift and drag for takeoff/landing.

Movement about the vertical axis is yaw. The rudder, mounted on the vertical stabilizer, is moved left or right to create a side-force that yaws the aircraft. This surface is specifically designed to control motion around the vertical axis, unlike the other surfaces which handle different axes: the elevator controls pitch (nose up or down), the ailerons control roll (wing tips rise or fall), and flaps primarily affect lift and drag for takeoff/landing.

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