Helicopter rotor blades

Details Helicopter rotor blades Helicopter rotor blades

1991-10-23

1993-04-06

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

416228, 416235, 416242, 416243, B64C 1116, B64C 2746

Patent

active

051998513

ABSTRACT:
A helicoper rotor blade includes at its outer end a tip vane having a mean chord length greater than fifty percent of a chord length of a blade central portion and a span length greater than fifty percent of the blade chord which in operation generates two approximately equal strength tip vortices to reduce an acoustic impulse and a resulting noise known as blade slap.

REFERENCES:
patent: 3467197 (1969-09-01), Spivey et al.
patent: 4046336 (1977-09-01), Tangler
patent: 4324530 (1982-04-01), Fradenburgh et al.
patent: 4334828 (1982-06-01), Moffitt

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