Composite tip weight attachment

Details Composite tip weight attachment Composite tip weight attachment

1975-06-25

1976-12-28

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With weight-balancing means

Self-shifting or selectively adjustable mass

416230, B64C 1126, B64C 2754

Patent

active

039998886

ABSTRACT:
A helicopter rotor blade of composite material, characterized by the absence of a spanwise metal spar, has tip weight attachment means for supporting stacks of washer-like metal shim weights in the composite material of the blade adjacent its tip to obtain both dynamic chordwise and static spanwise balance of the blade. Three holes are bored in the composite material from the underside of the blade into which three tip weight assemblies are inserted and are adhesively or otherwise secured to the composite material. Each assembly includes a cylindrical liner, a central hollow stud and a nut which engages external threads on the stud for holding the weights in stacked configuration. A plate forming a closure for the hole completes the skin of the blade and a screw threaded into the end of the stud secures the plate in place.

REFERENCES:
patent: 2460351 (1949-02-01), Hoffman et al.
patent: 2580363 (1951-12-01), Schnitt
patent: 2941603 (1960-06-01), Jovanovich
patent: 3103977 (1963-09-01), Negroni
patent: 3169412 (1965-02-01), Weeks
patent: 3484174 (1969-12-01), McCoubrey
patent: 3813186 (1974-05-01), Palacher et al.

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