Pinned airfoil propeller blade

摘要

An essentially composite propeller or fan blade is provided which is rotatably mounted to a blade retention pitch member by a pin radially outside of a propeller spinner or hub. The blade has a plurality of composite layers wrapped directly around a root fairing which engages the pin. The propeller blade has a motion limiter provided at the base thereof which cooperates with the blade retention pitch member to damp rotational movement of the blade about the pin to minimize blade angular excursions when centrifugal loads are low, to moderate blade vibratory motion, to help tune out undesirable blade resonant frequencies and to transmit force created by impact with foreign objects to the pitch member. By cooperating with the pitch retention member, the root of the blade may be more aerodynamically shaped than other composite blades which must absorb the force of impact in their root portions.