Cascade effect blown flap

Details Cascade effect blown flap Cascade effect blown flap

1975-05-07

1976-08-17

Kunin, Stephen G.

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

B64C 2104

Patent

active

039749878

ABSTRACT:
A control airfoil such as a wing flap is provided adjacent its leading edge with a plurality of parallel blowing slots extending spanwise of the flap and leading from a plenum in the interior of the flap, the plenum being supplied with high pressure air and the slots being so arranged in airtight relationship with the trailing edge of the wing that the slots are serially uncovered in a cascade arrangement, as the flap is deflected continuously downward from its neutral position, to blow a cascade of high pressure air rearwardly in successively small angle increments over the upper surface of the flap to continuously re-energize the boundary layer air thereon and thereby increase the coefficient of lift during landing of the aircraft by permitting extreme flap angles to be used.

REFERENCES:
patent: 2406917 (1946-09-01), Stalker
patent: 2444293 (1948-06-01), Holt
patent: 3009668 (1961-11-01), Nystrom
patent: 3188021 (1965-06-01), Young
patent: 3831886 (1974-08-01), Burdges et al.

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