Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent
1994-08-18
1997-01-28
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
416 31, 416223R, 416212R, B64C 2778
Patent
active
055971385
ABSTRACT:
A device for stabilizing yaw motion is provided for use on a helicopter having a main rotor rotatable about a main rotor axis, a power source, and a tail rotor boom with a longitudinal axis. The device includes a tail rotor and a gyroscopic mechanism. The tail rotor is mounted to the tail boom of a helicopter and is rotated about a tail rotor axis by the power source to generate a thrust force transverse to the tail boom and offset from the main rotor axis. The gyroscopic mechanism automatically varies the thrust force generated by the tail rotor to oppose yaw motions. The gyroscopic mechanism includes first and second variable pitch gyro arms extending along first and second gyro arm pitch axes, respectively, a support mechanism, and a pitch adjustor linkage. The support mechanism is configured to support the variable pitch gyro arms for pivotable movement about a gyro pivot axis between a nominal orientation and a tilted orientation so that the variable pitch gyro arms pivot about the gyro pivot axis from the nominal orientation toward the tilted orientation in response to yaw motion encountered by the gyro arms during flight to vary the thrust generated by the tail rotor. The pitch adjustor linkage is appended to the first gyro arm to adjust the pitch of the first gyro arm about the first gyro arm pitch axis.
REFERENCES:
patent: 1781883 (1930-11-01), Reed
patent: 2250826 (1941-07-01), Evevls
patent: 2384516 (1945-09-01), Young
patent: 2689099 (1954-09-01), Lightfoot
patent: 3004736 (1061-10-01), Culver et al.
patent: 3027948 (1962-04-01), Goland et al.
patent: 3211235 (1965-10-01), Bretl
patent: 3528633 (1970-09-01), Knemeyer
patent: 3532302 (1970-10-01), Dean
patent: 4028003 (1977-06-01), Krauss
patent: 4118143 (1978-10-01), Kavan
patent: 4272041 (1981-06-01), Mabuchi et al.
patent: 4427344 (1984-01-01), Perry
patent: 4759514 (1988-07-01), Burkam
patent: 4790724 (1988-12-01), Bousquest et al.
patent: 5305968 (1994-04-01), Arlton
patent: 5332362 (1994-07-01), Toulmay et al.
Rock, Gene, SSP-5, American Aircraft Modeler, 1973, pp. 41-45 and 76-79.
Information concerning the Graupner Heim helicopter contained in Neuheiten '91, pp. 22-23. Illustrations show the structure of the helicopter including the main rotor, frame, and landing gear.
Builidng Instructions for the Champion model helicopter produced by Hubschrauber Schluter. Two pages. Date unknown.
Building Plans for X-Cell thirty and forty series model helicopter produced by Miniature Aircraft USA, 1989, two pages.
Sales brochure for the Petit Helicopter, Sports Flight Helicopter, and helicopter accessories contained in the sales catalog for Hirobo Limited. Three pages. Date unknown.
Sales brochure for the Whisper Electric helicopter distributed by hobby dyamics Distributors. One Page. Date unknown.
Rotary Modeler, May/ Jun., 1992. One page.
Robinson, Frank, Increasing Tail Rotor Thrust and Comments on Other Yaw Control Devices, Journal of the American Helicopter Society, pp. 46-52, 1970.
Prouty, Raymond, W., Helicopter Performance, Stability, and Control, Title page and pages 187, 188, and 191, 1990.
Arlton David J.
Arlton Paul E.
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