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Flap (aeronautics)
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A flap is a high-lift device used to reduce the stalling speed of an aircraft wing at a given weight. Flaps are usually mounted on the wing trailing edges of a fixed-wing aircraft. Flaps are used to reduce the take-off distance and the landing distance. Flaps also cause an increase in drag so they are retracted when not needed.
Trailing edge flaps extended on the right on a typical airliner (an Airbus A310-300). Leading edge slats are also extended, on the left.
Trailing edge flaps extended on the right on a typical airliner (an Airbus A310-300). Leading edge slats are also extended, on the left.
The three orange pods are fairings streamlining the flap track mechanisms. The flaps (two on each side, on the Airbus A319) lie directly above these.
The three orange pods are fairings streamlining the flap track mechanisms. The flaps (two on each side, on the Airbus A319) lie directly above these.
Flaps during ground roll after landing, with spoilers up, increasing drag.
Flaps during ground roll after landing, with spoilers up, increasing drag.
North American T-6 trainer, showing its split flaps
North American T-6 trainer, showing its split flaps
High-lift device
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In aircraft design and aerospace engineering, a high-lift device is a component or mechanism on an aircraft's wing that increases the amount of lift produced by the wing. The device may be a fixed component, or a movable mechanism which is deployed when required. Common movable high-lift devices include wing flaps and slats. Fixed devices include leading-edge slots, leading edge root extensions, and boundary layer control systems.
High lift devices on an Air New Zealand Boeing 747-400 (ZK-SUH) on arrival to London Heathrow, England. The triple-slotted trailing edge flaps are wel
High lift devices on an Air New Zealand Boeing 747-400 (ZK-SUH) on arrival to London Heathrow, England. The triple-slotted trailing edge flaps are well displayed and the Krueger flaps on the leading edge also are visible.