ROTOR Russian patent published in 2002 - IPC

FIELD: aeronautical engineering; helicopter hingeless and steering rotors. SUBSTANCE: variable-pitch propeller includes blades connected with rotor shaft by means of flexible torsion bars which are resistant to bending and torsion. Each torsion bar is made in form of laminated beam in section between blade and shaft. torsion bar consists of load-bearing plates in thickness of high strength which are interconnected by means of interlayers made from low shear resistance material. Load-bearing plates are rigidly interconnected in attachment on side of blade by means of high- strength material and in attachment on side of axis of rotation of rotor load-bearing plates are rigidly interconnected or rigid attachment of outer plates of torsion bars is absent. EFFECT: wide change of flexural and torsional stiffness at optimal ratio. 7 cl, 20 dwg