CONVERTIPLANE AND DEVICE FOR AUTOMATIC SPREADING AND FOLDING OF MAIN ROTOR Russian patent published in 1997 - IPC

FIELD: transport engineering; convertiplanes provided with main rotor for vertical takeoff and landing. SUBSTANCE: convertiplane includes two parallel fuselages with common wing having outer panel and central beam and two engines kinematically linked with two propellers. Central beam mounted immovably is provided with pylon in its center portion; pylon is provided with additional vertical shaft of main rotor mounted for axial displacement and kinematically linked with output shafts of engines. Device for automatic fading and spreading of main rotor blades includes housing made in form of hub concentric relative to vertical shaft. Hub is provided with port on its lateral surface made over spiral curve and provided with end upper and lower semi-cylindrical sections whose centers lie in plane passing through vertical axis of hub at distance from its generatrix exceeding diameter of root portion of blade. Hub is mounted rotatably relative to profiled circular member having cylindrical outer surface which is mounted inside it. EFFECT: enhanced efficiency. 12 cl, 14 dwg