HELICOPTER AND METHOD OF CONTROL OF SINGLE-ROTOR HELICOPTER Russian patent published in 2004 - IPC

FIELD: aviation; single-rotor helicopters.

SUBSTANCE: proposed helicopter has fuselage with main rotor, tail and end booms and steering rotor; external outlines of cross-sections of tail boom are narrowing from rear cargo compartment towards end boom; end boom is made in form of profiled fin at angle of turn in horizontal plane. Mounted on side walls of tail boom are aerodynamic profile and aerodynamic flap over length of maximum inductive flow or air or aerodynamic profiles at change of angle of inclination of chord relative to vertical plane of symmetry of fuselage, thus forming force moment opposite to contra-rotating torque of main rotor. Method of control of single-rotor helicopter includes compensation of reaction of couplings acting on fuselage from main rotor torque, force moment of steering rotor; control in heading includes also effect of additional force moment from circulating flow of air from profiled fin mounted at the end of tail boom and turned in horizontal plane through angle of 5-7 deg. relative to vertical plane of symmetry of fuselage in direction opposite to rotation of main rotor.

EFFECT: enhanced controllability under conditions of critical density of air; increased flying altitude of helicopter.

6 cl, 4 dwg