CONTROL SYSTEM OF COAXIAL HELICOPTER Russian patent published in 2017 - IPC B64C27/10 B64C27/80 

FIELD: transportation; aviation.

SUBSTANCE: coaxial helicopter control system comprises a swash plate of a lower rotor, a mixing unit to control common and differential rotor blade pitch, a movable rod installed inside the upper rotor shaft cavity. The mixing unit is made of three two-arm levers hingedly mounted on the gear body. The first lever is located under the swash plate of the lower rotor and is kinematically connected to it, the second lever - on the bottom part of the gear, the third lever - between the two specified levers. A three-arm walking beam is fixed on one arm of the third lever, and with the other arm the third lever is kinematically connected to control elements of the common rotor blade pitch of both rotors. The three-arm walking beam by diametrically arranged arms is accordingly connected to the first two-arm lever and to the second two-arm lever. By the middle arm the specified three-arm walking beam is kinematically connected to control elements of the differential rotor blade pitch of both rotors.

EFFECT: reduced harmful resistance of a coaxial helicopter, costs for profile and induced resistance of blades.

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