Noise reduction in aircraft propellers

Details Noise reduction in aircraft propellers Noise reduction in aircraft propellers

1990-08-13

1993-03-02

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Plural impellers having relative movement or independent...

Coaxial rotation

416201A, 416237, 416238, 415119, B64C 1148

Patent

active

051904411

ABSTRACT:
The invention concerns reduction of tip vortices in aircraft propellers, wherein a fence having anhedral or dihedral is attached to the blades of the propeller. Another form of the invention is applicable to counterrotating propeller systems, wherein a fence is attached to the blades of the forward propeller of the system, and no fences are attached to the aft propeller.

REFERENCES:
patent: 1597175 (1926-08-01), Boening
patent: 2269287 (1942-01-01), Roberts
patent: 3294175 (1966-12-01), Bodner
patent: 4324530 (1982-04-01), Fradenburgh et al.
patent: 4664593 (1987-05-01), Hayashi et al.
patent: 4883240 (1989-11-01), Adamson et al.
patent: 4936746 (1990-06-01), Mayo et al.

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