Blade with reduced sound signature, for aircraft rotating aerofo

Details Blade with reduced sound signature, for aircraft rotating aerofo Blade with reduced sound signature, for aircraft rotating aerofo

1998-08-28

2000-09-12

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Tined or irregular periphery

416238, B63H 126

Patent

active

061168572

ABSTRACT:
A blade is disclosed for an aircraft rotating aerofoil. The aerodynamically profiled main part of the blade includes an external end part adjacent to the tip of the blade and extending along the span over a distance of at least 0.2 R, where R is the radius of the rotor. The end part having a rear camber over a distance along the span of at least 0.15 R, and the aerodynamically profiled main part includes also a front cambered part, immediately adjacent to the inside of the rear cambered end part.

REFERENCES:
patent: 2475337 (1949-07-01), Platt
patent: 3065933 (1962-11-01), Williams
patent: 3066742 (1962-12-01), Castles, Jr.
patent: 3467197 (1969-09-01), Spivey et al.
patent: 4142837 (1979-03-01), De Simone
patent: 5332362 (1994-07-01), Toulmay et al.
patent: 5584661 (1996-12-01), Brooks

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