Aeronautics and astronautics – Aircraft – heavier-than-air – Airplane sustained
Patent
1979-06-13
1981-07-28
Frankfort, Charles E.
Aeronautics and astronautics
Aircraft, heavier-than-air
Airplane sustained
D21 87, 46 79, 244 16, 244 45R, 244153R, B64C 3102, B64C 3908, A63H 3328
Patent
active
042806739
ABSTRACT:
A glider formed from a multi-sided tube open at its ends is disclosed. The body and lifting surfaces of the glider comprise a multi-sided tube including a top wall of planar configuration; a pair of opposed upper side walls of planar configuration integral with the top wall extending downward and outward a distance; a pair of opposed vertical side walls of planar configuration integral with the upper side walls; a pair of opposed lower side walls of planar configuration integral with the side walls extending downward and inward to a point inward of a vertical extension of the top wall and upper side wall intersections; a bottom wall extending between lower end walls and integral therewith enclosing the structure. The bottom wall includes a pair of upward extending planar sections meeting at a mid point between lower end walls to form a ridge. An upper cut-out symmetrical about a center line of the tube removes a substantial portion of the upper surfaces, and a lower cut-out symmetrical with the center line works in concert with the upper cut-out to produce maximum lift and stability. The glider of the present invention is suitable for both powered and non-powered flight.
REFERENCES:
patent: 1939682 (1933-12-01), Fleming
patent: 3600842 (1971-08-01), Bryman
patent: 3834654 (1974-09-01), Miranda
patent: 3981460 (1976-09-01), Ratony
patent: 4146199 (1979-03-01), Wenzel
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