Helicopter rotor blade

Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Radial flow devices

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416228, B64C 2746

Patent

active

046681698

ABSTRACT:
An outboard region of a helicopter rotor blade of aerofoil cross section has a thickness to chord ratio not greater than twelve percent and an inboard region has a thickness to chord ratio greater than twelve percent. Preferably, the thickness to chord ratio of the inboard region is greater than eighteen percent and may increase towards the root end to about twenty four percent. The inboard region may extend outwardly to a position not exceeding sixty percent of an operating radius of the rotor blade.

REFERENCES:
patent: 3782856 (1974-01-01), Salkind et al.
patent: 4248572 (1981-02-01), Fradenburgh
U.S. Ser. No. 318,662 filed 6-1943, Bitterli et al.

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