Aeronautics and astronautics – Aircraft – heavier-than-air – Airplane and helicopter sustained
Patent
1992-04-23
1995-01-17
Huppert, Michael S.
Aeronautics and astronautics
Aircraft, heavier-than-air
Airplane and helicopter sustained
244 124, 244 56, 244 66, 244 69, B64C 1148, B64C 2708, B64C 2722, B64C 2752
Patent
active
053819853
ABSTRACT:
A tiltwing aircraft, capable of in-flight conversion between a hover and forward cruise mode, employs a counter-rotating proprotor arrangement which permits a significantly increased cruise efficiency without sacrificing either the size of the conversion envelope or the wing efficiency. A benefit in hover is also provided because of the lower effective disk loading for the counter-rotating proprotor, as opposed to a single rotation proprotor of the same diameter. At least one proprotor is provided on each wing section, preferably mounted on the wingtip, with each proprotor having two counter-rotating blade rows. Each blade row has a plurality of blades which are relatively stiff-in-plane and are mounted such that cyclic pitch adjustments may be made for hover control during flight.
REFERENCES:
patent: 1806648 (1931-05-01), Salisbury et al.
patent: 2434276 (1948-01-01), Laskowitz
patent: 2494368 (1950-01-01), Steele et al.
patent: 2994492 (1961-08-01), Dobson et al.
patent: 3035789 (1962-05-01), Young
patent: 3248073 (1966-04-01), Blythe
patent: 4589611 (1986-05-01), Ramme et al.
patent: 5054716 (1991-10-01), Wilson
patent: 5054998 (1991-10-01), Davenport
Aviation Week, "Hiller Awarded VTOL Contract" Feb. 18, 1957 p. 37.
Rutherford John W.
Wechsler James K.
Ansley Virna Lissi
Huppert Michael S.
McDonnell Douglas Helicopter Co.
Scholl John P.
Stout Donald E.
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