HELICOPTER Russian patent published in 2005 - IPC

FIELD: aviation; single-rotor helicopters.

SUBSTANCE: proposed helicopter has fuselage with main rotor, tail and end booms and steering rotor; tail boom narrows from rear compartment of fuselage towards end boom; external outlines of cross-sections of end boom have shape of aerodynamic profile forming moment of force counter-acting to reaction torque of main rotor under action of velocity head of air during horizontal flight. Secured on side of tail boom is profiled deflector with aerodynamic outer surface; nose of this deflector is located at level of separation of induction flow of air created by rotation of main rotor from lateral surface of tail boom; inner surface of deflector embraces lower part of lateral surface of tail boom forming air passage narrowing under tail boom with longitudinal slit for discharge of reaction jet of air in way opposite to motion of main rotor above tail boom. Deflector is secured on tail boom at distance equal to 0.65-0.85 of radius of rotation of main rotor blade.

EFFECT: enhanced controllability of single-rotor helicopter equipped with steering rotor in yawing under conditions of critical density of air and increased flying altitudes.

2 cl, 3 dwg