FIELD: aircraft engineering.;SUBSTANCE: proposed helicopter comprises carcass (1), engine-propeller plant attached to helicopter body to incline for required angle relative to helicopter vertical axis. Coaxial propellers (4) feature rigid attachment of blades with automatic centrifugal-force-driven propeller windmilling. Mono or skeleton-slot propeller blades are solid or folding over their length. In compliance with the second version, helicopter body supports aerodynamic wings of yaw flight and helicopter turn. In compliance with the third version, single-rotor engine or reduction gear shaft is separated by gimbal drive that incorporates equal-angular-speed cardan joint enclosed by ball cup joint.;EFFECT: reduced weight of helicopter, fuel consumption, higher efficiency of engine and rotor.;5 cl, 18 dwg
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