Recent Progress on Development and Understanding of High Lift Systems,
BRITISH AEROSPACE WEYBRIDGE (ENGLAND)
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In aircraft design the constraints between the high speed cruise and the low speed takeoff and landing conditions force the designer to incorporate some form of high lift to device to improve the lift at low speed. Most aircraft, be they civil or military, have some form of high lift device that is normally used exclusively during take-off and landing, and for many years this has mainly been a mechanical alteration of the wing section shape over the inboard part of the wing. The complications of sweep, be it forward or backward, engine installation, lateral controls, undercarriage installation and high speed wing design have always been accommodated within the configuration of a trailing edge flap and in some cases a leading edge slat. This paper concentrates principally on the mechanical high lift device as it is used on transport type aircraft and examines the design process and recent progress on both the development of high lift device design and on the understanding of the physics of the flows that has been reached. It also suggests the likely future development and the way in which this may be achieved.