Method of making a hollow airfoil

Details Method of making a hollow airfoil Method of making a hollow airfoil

1977-09-21

1979-10-02

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156173, 156189, 156245, 156285, 156293, 264314, B64C 1124, B32B 1704, B32B 3102

Patent

active

041697499

ABSTRACT:
A method of making hollow aircraft rotor blades from laminated material. An xpandable mandrel is first made from curable materials and then a composite build-up of epoxy material is made by layering a plurality of prepreg plies of curable material over the expandable mandrel. The mandrel and build-up of epoxy materials are then placed in a mold and pressure is applied to expand the mandrel which, in turn, expands the build-up of material against the mold. The mandrel and composite build-up of material are then cured and the mandrel becomes an integral part of the rotor blade.

REFERENCES:
patent: 1504547 (1924-08-01), Egerton
patent: 2202014 (1940-05-01), Cougheed
patent: 2202042 (1940-05-01), Blount
patent: 3138506 (1964-06-01), Ross
patent: 3330550 (1967-07-01), Brownlee
patent: 3967996 (1976-07-01), Kamov et al.
patent: 3988103 (1976-10-01), Hoffmeister

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