Helicopter rotor blades

Details Helicopter rotor blades Helicopter rotor blades

1976-08-03

1978-03-07

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Laminated, embedded member or encased material

416226, 416240, 416241A, B64C 2746

Patent

active

040777405

ABSTRACT:
A helicopter rotor blade is constructed at least in part of composite material of the type in which fibres (such as glass or carbon fibres) are embedded in a matrix. The stiffness in the flapping plane, the lagging plane, or both are modified at one or more positions along the blade to provide advantageous resonance frequencies. Modification of the stiffness is achieved by diverting a substantial number of fibres inwardly towards the relevant spanwise neutral bending plane.

REFERENCES:
patent: 2484141 (1949-10-01), Alex
patent: 3021246 (1962-02-01), Hutter et al.
patent: 3065799 (1962-11-01), McCarty
patent: 3117630 (1964-01-01), Barish
patent: 3237697 (1966-03-01), Ford et al.
patent: 3321019 (1967-05-01), Dmitroff et al.
patent: 3476484 (1969-11-01), Brunsch
patent: 3669566 (1972-06-01), Bourquardez et al.
patent: 3713753 (1973-01-01), Brunsch
patent: 3999886 (1976-12-01), Ormiston et al.

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