Blade constructed of composite materials, having a structural co

Details Blade constructed of composite materials, having a structural co Blade constructed of composite materials, having a structural co

1988-06-23

1990-06-19

Van Balen, William J.

Stock material or miscellaneous articles

Sheet including cover or casing

Foamed or expanded material encased

244123, 416229R, 416230, 416241A, 428 73, 428116, 428157, 428159, 428160, 4283044, 4283166, B32B 326, B64C 1106

Patent

active

049352776

ABSTRACT:
Helicopter rotor blade constructed of composite materials has a structural core (1) and a covering of profiled cladding (8). The structural core (1) includes all the structural elements of the blade, while the covering of the cladding (8) is a non-stress-bearing covering comprising an external rigid and thin shell (9a-9b), with the desired aerodynamic porfile, and a layer (10a-10b) of a ligth and flexible comformable non-stress-bearing material, such as a foam, ensuring the filling between the structural core (1) and the external shell (9a-9b). The foam layer (10a-10b) absorbs and compensates for the differences in shape between the contour of the structural core (1) and the precise aerodynamic profile of the non-stress-bearing external shell (9a-9b). The blade covering is expendable and evolutive spanwise as well as chordwise, with an external shell exhibiting an excellent surface condition, good erosion behavior and impact resistance, and easy to repair.

REFERENCES:
patent: 3028292 (1962-04-01), Hinds
patent: 4268571 (1981-05-01), McCarthy
patent: 4335174 (1982-06-01), Belko
patent: 4335182 (1982-06-01), Brand et al.
patent: 4626172 (1986-12-01), Mouille et al.
patent: 4664974 (1987-05-01), Sherwood
patent: 4753836 (1988-06-01), Mizell

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