Helicopter rotor blades

Details Helicopter rotor blades Helicopter rotor blades

1976-05-18

1978-03-07

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Tined or irregular periphery

416237, B64C 2746

Patent

active

040777413

ABSTRACT:
A helicopter rotor blade includes a rearwardly swept tip portion having a leading edge of aerofoil profile located forward of the leading edge of a central portion of the blade, and blended with a sharp tip edge of higher sweep magnitude than the leading edge and extending rearwardly to an extreme tip of the blade. A rearwardly swept trailing edge extends from a junction with the trailing edge of the central portion to the extreme tip so that the tip portion has a chord dimension greater than that of the central portion of the blade.
In operation, the rotor blade utilizes a stable vortex dominated flow field created over the tip portion to provide operational advantages in respect of both a retreating and an advancing blade.

REFERENCES:
patent: 1692081 (1928-11-01), La Cierva
patent: 2152861 (1939-04-01), Bennett
patent: 3066742 (1962-12-01), Castles
patent: 3399731 (1968-09-01), Giles
patent: 3467197 (1969-09-01), Spivey et al.
patent: 3721507 (1973-03-01), Monteleone
patent: 3822105 (1974-07-01), Jepson
patent: 4012172 (1977-03-01), Schwaar et al.

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