Composite flexural yoke for helicopters

An improved composite all fiberglas yoke for coupling helicopter blades to a rotatable mast, comprising:

• an elongate loop of glass fibers defining a longitudinal axis, with two long sides of the loop extending parallel to the longitudinal axis;
• and
• a plurality of layers of bias ply glass fibers intersticed between the fibers of said loop of glass fibers and arranged in planes parallel to the longitudinal axis of said loop along said long sides of the loop, said plurality of layers of bias ply glass fibers and said elongate loop of glass fibers being embedded in a cured adhesive to form a unitary structure and defining means for coupling said yoke to said rotatable mast substantially intermediate said two long sides whereby torque is transmitted from the shaft to the yoke intermediate said two long sides.