Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Formed with main spar
Patent
1993-11-01
1996-06-18
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Formed with main spar
416230, 416241A, F01D 514
Patent
active
055271553
ABSTRACT:
A variable pitch fan for a helicopter equipped with a NOTAR.TM. mechanical antitorque directional control system comprises a plurality of blade assemblies. Each blade assembly includes a blade portion, which is molded from a blended material which includes fiber reinforced polypropylene. A key to the invention is the use of long fibers, having a length of at least approximately one-half inch, for reinforcement, the long fibers providing for about twice the pull-out strength of short or chopped fibers. Another key aspect of the invention is the use of a blowing agent in the blended material, which serves to reduce weight and warpage by creating a foamed structure having a variable density, the structure retaining considerable strength because of the fiber reinforcement. The blade portion is molded about a spar which has holes therethrough, the holes providing a mechanical interlock between the blade and the spar.
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Chen Steve P.
Patel Ramesh J.
Schibler John E.
Larson James A.
Look Edward K.
McDonnell Douglas Corp.
Stout Donald E.
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