Upper surface blown powered lift system for aircraft

Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils

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244207, 244215, B64C 338, B64C 2104

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active

044470282

ABSTRACT:
In an aircraft having a pair of engines mounted forwardly of the wing and discharging jet exhaust over the wing for augmented lift, a trailing edge flap is positioned directly behind each of the engines. Each flap has a stowed position for the cruise mode, a rearwardly and downwardly extending position for maximum deflection of the jet exhaust downwardly for STOL operation, and various intermediate positions. The upper aerodynamic surface of each flap is curved in a manner that the radius of curvature increases along the chord length of the flap from the forward knee of the flap to the trailing edge of the flap. Each flap is moved from its stowed position, through intermediate positions to its fully deployed position in a manner that the upper aerodynamic surface of each flap forms a smooth and continuous extension of the fixed rear portion of the upper aerodynamic surface of the wing. Vortex generators are provided on the upper wing surfaces forward of flaps to generate vortices in the jet exhaust that travels over the upper surfaces of the flaps. This arrangement results in improved lift characteristics, reduced pitching moment with the flap in its deployed position, and improved operating characteristics.

REFERENCES:
patent: 3583660 (1971-06-01), Hurkamp et al.
patent: 3767140 (1973-10-01), Johnson
patent: 3971534 (1976-07-01), Grotz
patent: 3987983 (1976-10-01), Cole
patent: 4019696 (1977-04-01), Hirt et al.
patent: 4283029 (1981-08-01), Rudolph
May et al., "Aerodynamic Design of the Boeing YC14 Advanced Med. STOL Transport", AIAA No. 75-1015, 1975.
Bowden et al., "Propulsion Integration for a Hybrid Propulsive-Lift Sys.", SAE 740471, 1974.
Skardahl et al., "Nozzle Development for the Upper Surface-Blown Jet Flap on the YC-14", SAE 740469, 1974.

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