Three-position variable camber flap

Details Three-position variable camber flap Three-position variable camber flap

1979-05-29

1981-04-21

Frankfort, Charles E.

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244219, B64C 350

Patent

active

042628687

ABSTRACT:
A wing leading edge variable camber flap for an airplane, the flap having a pivoted bullnose and flap extension and retraction linkage mechanism for sequencing the flap into three positions of operation: a stowed position for high speed cruise operation of the airplane; a first forwardly and downwardly extended flap position whereat an aerodynamic slot is formed between the trailing edge of the flap and the relatively fixed leading edge of the wing, coupled with a steep flap angle-of-deflection of the flap relative to the wing chord plane, for low speed landing operation of the airplane; and a further forwardly extended second position whereat the trailing edge of the flap is moved to an abutment relation with the leading edge of the wing to seal off the aerodynamic slot, to form a substantially aerodynamically continuous upper surface and the flap angle-of-deflection being less than the landing position, for creating less drag during take-off operation of the airplane.

REFERENCES:
patent: 3504870 (1970-04-01), Cole et al.
patent: 3743219 (1973-07-01), Gorges
patent: 3910530 (1975-10-01), James et al.
patent: 4159089 (1979-06-01), Cole

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