MAIN ROTOR Russian patent published in 2007 - IPC B64C27/32 

FIELD: main rotors and methods of control of main rotors.

SUBSTANCE: blades of main rotor are secured to tips which are secured in their turn on outer ends of double-arm levers which are provided with feathering and flapping hinges. Used as feathering hinges are radial-thrust bearings whose inner races rest against ring-shaped projection made in center part of double-arm lever and outer races are secured in bearing body which is used as flapping hinge fitted with pins on opposite sides and located in horizontal plane, they are engageable with bearings secured in walls of pentahedral body rigidly secured to driven shaft by means of flange mounted on this shaft. Wobble plate is made on principle of engagement of magnetic fields of electromagnets with magnet secured on carrier which is rigidly connected with swashplate which is articulated on ball hinge secured on rod coaxially and rigidly connected with driven shaft. Swashplate is provided with five ears over its edges which are articulated with crossing axles provided with rods mounted inside driven shaft. Wobble plate includes seven electromagnets secured on helicopter floor. Central electromagnet is mounted coaxially relative to driven shaft and six other electromagnets are smoothly distributed over circumference around central electromagnet. Leads of each electromagnet are connected with switches mounted in the same sequence as electromagnets and are found in button control panel; plane passing through centers of front and rear directions is located strictly along helicopter longitudinal axis so that helicopter should maintain rectilinear motion during straight-line flight. Contacts of switches are connected to DC source busbars by means of buttons.

EFFECT: simplified construction; increased main rotor thrust.

2 cl, 5 dwg