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In aircraft what is spoiler?

Updated: 11/2/2022
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15y ago

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A Spoiler is a device on the top surface of a primary lifting surface (wing) that can either be used individually to assist in a turn by causing the plane to bank, or together to reduce lift to bring about a speed reduction and increase the approach angle. Unlike ailerons used for banking, or current-style (Fowler) flaps used for increasing lift for landing/takeoffs, the spoiler doesn't re-direct the airflow from the trailing edge of the wing. Instead, its typically a small section of skin on the top section of the wing, usually along the thickest point and towards the wingtip, that hinges up, thus killing the lift along that area of the wing. This does two things for a turn; one, it causes the wing to drop, thus causing the wing to fall into the turn, and two, it increases the drag on the wing, which helps yaw the nose of the plane into the turn. They can also be used in pairs to help increase the approach angle for landing.

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