Composite helicopter spar and means to alleviate stress concentr

Details Composite helicopter spar and means to alleviate stress concentr Composite helicopter spar and means to alleviate stress concentr

1975-06-26

1977-02-22

Freeh, William L.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Nonmetallic resilient mounting

416226, 416230, B64C 1104, B64C 2746

Patent

active

040089800

ABSTRACT:
A cross-beam helicopter rotor wherein the pitch actuator shaft passes through an elliptically shaped hole in the unidirectional, composite helicopter spar, each of selected dimension so that the stress concentration factor across the spar at the hole is minimized when the spar is carrying balanced centrifugal blade loads. The shaft also passes through a centering pin which is supported in the spar hole by an elliptically shaped plug of selected dimension so that when supported from the spar hole by elastomer of selected shape factor, durometer and dimension, the plug and pin are load isolated from the spar and the stress concentration factor across the spar at the hole is substantially unchanged from that of the unplugged hole both during balanced and unbalanced centrifugal blade load operation of the spar, and so that the elastomer transmits unbalanced centrifugal blade loads therethrough from the spar to the plug and pin for centering the rotor.

REFERENCES:
patent: 2363469 (1944-11-01), Goldschmidt
patent: 3484174 (1969-12-01), McCoubrey
patent: 3669566 (1972-06-01), Bourquardez et al.
patent: 3804552 (1974-04-01), Covington
patent: 3874815 (1975-04-01), Baskin
patent: 3874820 (1975-04-01), Fenaughty

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