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Controlling Roll

Credit: National Air and Space Museum, Smithsonian Institution

Ailerons control roll.

On the outer rear edge of each wing, the two ailerons move in opposite directions, up and down, decreasing lift on one wing while increasing it on the other. This causes the airplane to roll to the left or right. To turn the airplane, the pilot uses the ailerons to tilt the wings in the desired direction.

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