Which control surface primarily controls roll about the longitudinal axis?

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Multiple Choice

Which control surface primarily controls roll about the longitudinal axis?

Explanation:
Roll about the longitudinal axis is controlled primarily by the ailerons. These surfaces are on the wings and move in opposite directions: when one aileron deflects upward and the other downward, lift on one wing decreases while lift on the other increases, creating a rolling motion that tilts the aircraft from side to side. Elevators control pitch about the lateral axis (nose up or down), and the rudder controls yaw about the vertical axis (nose left or right). Spoilers can help or assist with roll by reducing lift on a wing, but the primary surface for initiating roll is the aileron.

Roll about the longitudinal axis is controlled primarily by the ailerons. These surfaces are on the wings and move in opposite directions: when one aileron deflects upward and the other downward, lift on one wing decreases while lift on the other increases, creating a rolling motion that tilts the aircraft from side to side. Elevators control pitch about the lateral axis (nose up or down), and the rudder controls yaw about the vertical axis (nose left or right). Spoilers can help or assist with roll by reducing lift on a wing, but the primary surface for initiating roll is the aileron.

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