Variable camber leading edge for airfoil

Details Variable camber leading edge for airfoil Variable camber leading edge for airfoil

1977-07-21

1979-10-23

Kelmachter, Barry L.

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244214, B64C 348

Patent

active

041717872

ABSTRACT:
An airfoil having a support frame, a rigid nose section, and upper and lower variable camber skin sections extending from the nose section rearwardly to the support frame. The frame has a rigid mounting arm which extends forwardly into the variable camber section, and a pivot link is connected from that mounting arm to a lower portion of the nose section so that is is able to swing downwardly and rearwardly to its cambered position. A toggle linkage connects an upper portion of the nose section to the frame just beneath the upper variable camber skin section. Flexure of the toggle linkage during downward movement of the nose section reduces the chord length of the arc of the variable camber upper skin section so that a proper continuous curve is formed by the upper variable camber skin section from the nose section back to the frame. Other linkage coordinates the movement of the toggle link, the pivot link, and other actuating linkage which moves the rear end of the variable camber lower skin section rearwardly.

REFERENCES:
patent: 1763888 (1930-06-01), Griswold
patent: 1828981 (1931-10-01), Parker
patent: 2022806 (1935-12-01), Grant
patent: 2650047 (1953-08-01), Carhart et al.
patent: 2749060 (1956-06-01), Brady et al.
patent: 2763448 (1956-09-01), Davie
patent: 3836099 (1974-09-01), O'Neill et al.
patent: 3941334 (1976-03-01), Cole
patent: 4040579 (1977-08-01), McKinney

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