Strake fence flap

Details Strake fence flap Strake fence flap

1986-05-08

1988-04-26

Barefoot, Galen

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244213, 244 91, B64C 2306

Patent

active

047399570

ABSTRACT:
The strake fence flap is a device which may be tailored to the aircraft to augment the low-speed lift of canard-configured general aviation aircraft with little or no longitudinal trim change and no cruise drag penalty. The strake fence flap is deployed along the upper surface of each of the strakes on the canard aircraft. The strake fence flap is hinged along its lower edge which allows it to be retracted and extended as needed. In the cruise configuration, the strake fence flap is folded flush with the strake upper surface. For deceleration or landing where increased lift and drag are required, the strake fence flap is extended. The frontal area of the strake fence flap becomes exposed resulting in additional drag. The geometry and positioning of the fence causes the flow to separate from the upper edge of the fence and to roll up into a vortex which trails over the strake. The intense suction which accompanies the vortex acts directly on the strake upper surface, thereby significantly increasing the lift.

REFERENCES:
patent: D266161 (1982-09-01), Rosenthal
patent: 2650752 (1953-09-01), Hoadley
patent: 3471107 (1969-10-01), Ornberg
patent: 3744745 (1973-07-01), Kerker
patent: 4466586 (1984-08-01), Burnham

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