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Any flap that allows air to pass between the wing and the flap is considered a slotted flap. The slotted flap was a result of research at Handley-Page, a variant of the slot that dates from the 1920s, but was not widely used until much later. Some flaps use multiple slots to further boost the effect.
The triple-slotted trailing edge flaps are well displayed and the Krueger flaps on the leading edge also are visible. 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 ...
In general, blown flaps can improve the lift of a wing by two to three times. Whereas a complex triple-slotted flap system on a Boeing 747 produces a coefficient of lift of about 2.45, [6] external blowing (upper surface blowing on a Boeing YC-14) improves this to about 7, [6] and internal blowing (jet flap on Hunting H.126) to 9. [7]
The high-lift Fowler flap is located on the trailing edge of an airplane wing which increases wing area, lift, and drag. [4] The flap often forms part of the upper surface of the wing similar to a plain flap or a split flap, but upon extension it slides rearward before lowering. Fowler flaps always feature one or more slots.
KLM Fokker 70, showing position of flap and liftdumper flight controls. The liftdumpers are the lifted cream-coloured panels on the wing upper surface (in this picture there are five on the right wing). The flaps are the large drooped surfaces on the trailing edge of the wing.
In this picture, the slats are drooped. Note also the extended trailing-edge flaps. Slats on the leading edge of an Airbus A318 of Air France Automatic slats of a Messerschmitt Bf 109 The wing of a landing Airbus A319-100. The slats at the leading edge and the flaps at the trailing edge are extended.
In conjunction with the leading-edge slats, 74% of the trailing edge incorporates high-lift slotted flaps, which together with interrupter blades atop each wing when roll control is lost at very low airspeed, allows for a tight turning radius. The Helio Courier could maintain control at speeds as low as 27 miles per hour (43 km/h).
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