Fiber reinforced composite spar for a rotary wing aircraft

Details Fiber reinforced composite spar for a rotary wing aircraft Fiber reinforced composite spar for a rotary wing aircraft

1984-09-19

1986-11-11

Bell, James J.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Formed with main spar

416230, 428 36, 428105, 428113, 428408, 428413, 428902, B63H 120

Patent

active

046219803

ABSTRACT:
The present invention discloses a damage tolerant composite article comprising a plurality of layers of both graphite and polyaramide fibers. The graphite fiber layers are oriented at angles of about .+-.30.degree. and about .+-.15.degree. to the longitudinal axis while the polyaramide fiber layers are oriented at about .+-.14.degree. to the longitudinal axis. Composite structures of this construction will have increased damage tolerance while maintaining the required bending and torsional stiffness.

REFERENCES:
patent: 3713753 (1973-01-01), Brunsch
patent: 3768760 (1973-10-01), Jensen
patent: 4242160 (1980-12-01), Pinter et al.
patent: 4255087 (1981-03-01), Wackerle
patent: 4255478 (1981-03-01), Crane
patent: 4273601 (1981-06-01), Weingart
patent: 4404053 (1983-09-01), Saffire
patent: 4452658 (1984-06-01), Schramm

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