Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1975-06-10
1976-01-27
Blix, Trygve M.
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
B64C 2306
Patent
active
039348440
ABSTRACT:
An aircraft has air pumping devices which retain, concentrate and augment vorticity shed from a surface of the moving aircraft in such a way as to allow the formation of a lift producing and drag reducing free vortex which travels along with the aircraft (standing vortex), together with a means of supplying thrust for the aircraft. Air flowing past a shield which extends upwardly from the forward edge of a horizontal base causes the shedding of vorticity of one sign into a cavity-like region formed by the shield, base and the housings of a pair of thrusters at the lateral edges of the base. Each thruster includes a cylindrical housing open at both ends through which air is pumped by a power driven propeller, the blades of which rotate in a generally vertical plane, to supply forward thrust for the aircraft. Each housing has an opening to the cavity-like region forward (or up-wind) of the propeller so that air also is pumped from the cavity-like region. This pumping action retains, augments, and concentrates the vorticity and results in the formation of the free vortex stretching transversely across the cavity-like region. The lift producing ability of the free vortex may be further enhanced by an air pumping device, preferably a power driven propeller having an inclined shaft placed centrally in the cavity-like region which augments the free vortex air flow. Alternatively, vorticity shed from a surface of the moving aircraft may be retained, concentrated, and augmented to form a free vortex by a pair of rotating bladed discs which are placed at inclined angles at the edges of the aircraft. The vortex extends from one disc to the other. The forward thrust produced by the pumping action of the rotating discs may be supplemented by powered propellers.
REFERENCES:
patent: 3480234 (1969-11-01), Cornish
patent: 3831885 (1974-08-01), Kasper
Blix Trygve M.
Sauberer Paul E.
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