Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent
1982-06-14
1985-03-26
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
244 6, 244 1711, 416179, 415209, B64C 2782
Patent
active
045068496
ABSTRACT:
A helicopter tail rotor (14) is provided with a thrust ring. The thrust ring comprises an annular airfoil (16) having a circular opening which is aligned coaxially with the rotor (14). The plane of the airfoil (16) is essentially parallel to the plane of the rotor (14) but slightly offset downstream from the rotor (14). The cross section of the airfoil (16) can have a wide variety of configurations including flat and cambered. The tip vortices (30) produced by the rotor (14) are captured near the downstream surface of the airfoil (16) to produce a circulating airflow (32) that draws air from the upstream region of the airfoil (16) through the opening therein. The aerodynamic action of the airfoil (16) widens the wake diameter of the wash from rotor (14), increases rotor (14) thrust efficiency, reduces the noise level of rotor (14), enhances transverse stability and lowers the vibration level experienced by helicopter (10). The airfoil (16) further serves as a guard to protect the rotor (14).
REFERENCES:
patent: D197447 (1964-02-01), Friedrich
patent: 2123657 (1938-07-01), Munk
patent: 2510561 (1950-06-01), DeLaval
patent: 2876964 (1959-03-01), Streib
patent: 2922277 (1960-01-01), Bertin
patent: 3054578 (1962-09-01), Brocard
patent: 3129905 (1964-04-01), Taylor
patent: 3506219 (1970-04-01), Moville et al.
patent: 3856238 (1974-12-01), Malvestuto, Jr.
patent: 4196877 (1980-04-01), Mutrux
Barefoot Galen L.
Textron Inc.
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