Helicopter main rotor blade balance weight retention assembly

Details Helicopter main rotor blade balance weight retention assembly Helicopter main rotor blade balance weight retention assembly

2006-08-29

2006-08-29

Nguyen, Ninh H. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

With weight-balancing means

C416S14600A, C416S500000

Reexamination Certificate

active

07097427

ABSTRACT:
A helicopter main rotor blade balance weight retention system and assembly having a base plate (105), at least one support post (107) integral with the base plate and extending out perpendicularly from the base plate, a plurality of balance weights (109), a retaining nut plate (111), and one or more fastening bolts (113) for securing the balance weights to the base plate, and the base plate to the rotor blade. The balance weights (109) include apertures (117, 119) through which the support posts and the fastening bolts pass. The apertures through which the support posts pass are dimensioned such that the a snug fit is formed between the support posts and the balance weight; but the apertures through which the fastening bolts pass are dimensioned such that the threaded portions of the fastening bolts are not subjected to any shear loads from the balance weights due to the centrifugal force generated by the rotating rotor blades. The weight retention assembly is installed into pockets in the blade tip.

REFERENCES:
patent: 3999888 (1976-12-01), Zincone
patent: 5273398 (1993-12-01), Reinfelder et al.
patent: 5346367 (1994-09-01), Doolin et al.
patent: 6139271 (2000-10-01), Chadwick

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