초록 ▼

A helicopter rotor system in which a plurality of rotor blades are attached to the rotor mast. Each blade has a spar formed of fibers bundled and bonded together inside a skin. These fibers are divided into two bundles, each of which has a bight with a bend and two arms that double back into the spa

A helicopter rotor system in which a plurality of rotor blades are attached to the rotor mast. Each blade has a spar formed of fibers bundled and bonded together inside a skin. These fibers are divided into two bundles, each of which has a bight with a bend and two arms that double back into the spar. The bights are joined to the mast by spaced-apart attachments. The attachments may be plate-like, and can be shaped to provide initial coning and camber angles.

대표청구항 ▼

A helicopter rotor system comprising: a rotary mast having an upright axis; three or more rotor blades mounted to said rotary mast to be turned by said mast, each said blade having a respective longitudinal axis directed away from said mast, all of said rotor blades being substantially identical to

A helicopter rotor system comprising: a rotary mast having an upright axis; three or more rotor blades mounted to said rotary mast to be turned by said mast, each said blade having a respective longitudinal axis directed away from said mast, all of said rotor blades being substantially identical to one another, and being angularly spaced apart around said mast, each said blade comprising a skin forming an airfoil and an internal region, a counterweight rod and a spar extending longitudinally inside said region, said spar comprising a bundle of aligned fibers which, inside said region are bonded to each other, to said skin, and to said counterweight rod, said bundle being doubled and divided so as to form inboard of said skin a pair of U-shaped bight portions, each with a bend and a pair of arms, said arms being stiffly flexible, said fibers inside said region constituting continuations of the fibers in said bight portions, said fibers in bight portions being bonded together, whereby the total cross-section area of said fibers is substantially constant from the inboard end of said arms through the major portion of the length of the spar; attachment means attaching each of said bight portions to said mast at locations spaced apart from one another and substantially spaced from the center of said shaft, both on the same side of the center of the mast; a longitudinally-extending torque tube rigidly attached to said counterweight rod at a first end of each said torque tube, and a first bearing member adjacent to the other end of said torque tube, said torque tube having an axis; and a second bearing member mounted to said attachment means and to said first bearing member, whereby said torque tube is rotatable around its own axis, and can move in any angular direction away from said longitudinal axis around the center of said second bearing means, whereby to enable lead/lag, feathering and flapping movements.