Blade for rotary wing aircraft

Details Blade for rotary wing aircraft Blade for rotary wing aircraft

1998-12-21

2000-11-07

Verdier, Christopher

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Tined or irregular periphery

416223R, 416237, 416238, B64C 1116, B64C 2746

Patent

active

061427381

ABSTRACT:
A blade for a rotary wing aircraft includes a blade tip winglet intended to reduce the blade-vortex interaction noise during descending flight. The winglet has, in plan view, an at least approximately trapezoidal shape, and the mean value of a chord C.sub.1 of the winglet is between 25% and 40% of a chord C.sub.0 of the main part of the blade. Compared with a conventional rectangular tip, and for the same aerodynamic thrust, the reduction in noise associated with use of the blade tip winglet can be as much as 40%.

REFERENCES:
patent: 1888056 (1932-11-01), Verzillo et al.
patent: 3721507 (1973-03-01), Monteleone
patent: 4046336 (1977-09-01), Tangler
patent: 4248572 (1981-02-01), Fradenburgh
patent: 5199851 (1993-04-01), Perry et al.
French Search Report dated Aug. 18, 1998.

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