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Spoiler (aeronautics)
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In aeronautics, a spoiler is a device which intentionally reduces the lift component of an airfoil in a controlled way. Most often, spoilers are plates on the top surface of a wing that can be extended upward into the airflow to spoil the streamline flow. By so doing, the spoiler creates a controlled stall over the portion of the wing behind it, greatly reducing the lift of that wing section. Spoilers differ from airbrakes in that airbrakes are designed to increase drag without disrupting the lift distribution across the wing span, while spoilers disrupt the lift distribution as well as increasing drag.
A close look at the inner workings of spoilers in lift dump deployment during the landing of an Airbus A320.
A close look at the inner workings of spoilers in lift dump deployment during the landing of an Airbus A320.
A close look at the spoiler (the parts of the wing that are raised up) during the landing of an Airbus A321.
A close look at the spoiler (the parts of the wing that are raised up) during the landing of an Airbus A321.
A view of the right wing of a Boeing 767-300ER during descent with spoilers partially deployed.
A view of the right wing of a Boeing 767-300ER during descent with spoilers partially deployed.
Spoilers deployed to slow down for descent on a Qantas Boeing 737-800.
Spoilers deployed to slow down for descent on a Qantas Boeing 737-800.
Stall (fluid dynamics)
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In fluid dynamics, a stall is a reduction in the lift coefficient generated by a foil as angle of attack increases. This occurs when the critical angle of attack of the foil is exceeded. The critical angle of attack is typically about 15°, but it may vary significantly depending on the fluid, foil, and Reynolds number.
Airflow separating from an airfoil at a high angle of attack, as occurs at a stall.
Airflow separating from an airfoil at a high angle of attack, as occurs at a stall.
A Schweizer SGS 1-36 being used for deep-stall research by NASA over the Mojave Desert in 1983.
A Schweizer SGS 1-36 being used for deep-stall research by NASA over the Mojave Desert in 1983.