Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1974-09-25
1976-01-06
Blix, Trygve M.
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
416 23, 416240, B64C 344
Patent
active
039306267
ABSTRACT:
The angular configuration of a fluid control surface, with respect to the relative direction of fluid flow, is controlled by selectively heating the structural portions of only one side of the control surface to expand the structural members on the one side with respect to the structural members on the other side for warping the control surface generally from its leading to its trailing edge. Particularly, the camber of an airplane wing is changed by this selective heating for controlling the wing portion lift. Preferably, wires extend generally from the leading edge to the trailing edge of the wing as wing structural members closely adjacent the upper and lower surfaces of the wing, with both sets of wires being prestressed to provide an intermediate camber for the wing portion when the upper and lower wires are the same temperature, a generally symmetrical wing configuration when only the lower wires are heated, and a high lift maximum camber when only the upper wires are heated. The wires may be electrically heated by the passage of current therethrough, closely adjacent the wing surface for air cooling, deeply embedded in the wing structure for insulation, or contained within concentric tubes conducting a cooling or heating fluid. Further, the wires may be organic synthetic fibers with electrically conductive material embedded in them for thermal expansion, or a composite of electrically conductive and non-electrically conductive fibers for thermal expansion, or composed of an electrostrictive material to shorten upon the passage of electrical current, or of composite structure as above mentioned, with an electrostrictive component for shortening with the passage of a current.
REFERENCES:
patent: 2523427 (1950-09-01), Hampshire
patent: 3042371 (1962-07-01), Fanti
Beall, Jr. Thomas E.
Blix Trygve M.
Kelmachter Barry L.
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