Variable camber flap

Details Variable camber flap Variable camber flap

1977-05-31

1979-06-26

Kelmachter, Barry L.

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244219, B64C 350

Patent

active

041590899

ABSTRACT:
A variable camber leading edge flap and linkage mechanism for allowing two different extended operating positions of the flap, i.e. a landing position whereat an aerodynamic slot is formed between the aft edge of the flap and the fixed leading edge of the wing, coupled with a relatively steep flap angle relative to the wing chord plane; and a take-off position whereat the aerodynamic slot is closed and the flap angle is less than at the landing position. Also, a pair of cam mechanisms are interposed between linkages and sequenced in their operating functions to alternately restrain and release certain of the linkage members in order to open or close the aerodynamic slot and change the flap angle in a manner that insures that air loads acting on the variable camber flap do not cause linkage oscillation and flap instability. Further, through ball joint connections between the flap member and its actuating linkage mechanism, and by altering the degree of angular rotation of the spanwise spaced sets of flap linkage mechanisms, the flap panel can be made to twist torsionally spanwise along the wing leading edge providing a variable flap angle and aerodynamic slot to improve the aerodynamic efficiency of the wing and flap combination.

REFERENCES:
patent: 3941334 (1976-03-01), Cole

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