Fluid reaction surfaces (i.e. – impellers) – With fluid passage in working member communicating with... – Air and watercraft propellers
Patent
1985-12-16
1987-04-07
Powell, Jr., E. A.
Fluid reaction surfaces (i.e., impellers)
With fluid passage in working member communicating with...
Air and watercraft propellers
416 24, B64C 2764
Patent
active
046556850
ABSTRACT:
A helicopter main rotor blade having built-in twist for improved hover performance is provided with a trailing-edge, short span slot near the tip end of the blade for upwardly directing a stream of pressurized air therefrom. The upward ejection of air from the slot untwists the blade, which will enhance the forward flight performance of the blade. A method of modulating the ejection of air from the slot is disclosed for antivibratory control.
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R. W. Prouty, "Pitching Moments have Nothing to do with Batting Averages, Except when they Concern Rotor-Blade Designers", pp. 17-19, 21 & 22, Rotor & Wing International, Aug. 1984.
R. W. Prouty, "Aerodynamics", pp. 14-18, Rotor & Wing International-Jan. 1983.
Linden Gerald E.
Powell, Jr. E. A.
United Technologies Corporation
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