CONTROLLABLE MAIN ROTOR Russian patent published in 1995 - IPC

FIELD: aircraft engineering. SUBSTANCE: rotor has four lifting blades-cantilevers 1 which are secured to the bushing of the main rotor via junction units 10 and axial pivots 3 used for changing total pitch of the rotor. There are vertical pivots 6 in front of the axial pivots. Pivots 6 allow the cantilever to be movable in the plane perpendicular to the axis of rotation of the bushing. Unit 7 serves for securing the bushing to the reduction gear shaft. Lever 4 is used for changing angle of attack of the blade-cantilever. The plate of skewness automat 5 serves for cyclic changing of attack angle of blades 1. A ball-screw mechanism with electric drive 8 is used for moving the blade in the plane, perpendicular to the axis of rotation of the bushing, and secured to the journal of vertical pivot 9. Compressed air is supplied to the spaces of the cantilevers through air ducts 2 to create an air circulation about them. The air supply is controlled by air-operated system 2. Brake 3 with locking unit is used for stop of the rotor in flying when the rotor turns to the independent operation condition. EFFECT: improved aerodynamic characteristics. 4 dwg