MULTIROTOR CONVERTIBLE HIGH-SPEED HELICOPTER Russian patent published in 2015 - IPC B64C37/00 B64C27/28 

FIELD: aircraft engineering.

SUBSTANCE: this helicopter is equipped with the system of distributed thrust of different-size rotors in X2+3 configuration. One smaller rotor turning in vertical plane is fitted at fuselage end and panels of first swept-forward wing and second swept-back X-like wing. Besides, there are two large and smaller rotors. Helicopter represents a monoplane of two-beam configuration with mid-wing. It comprises fuselage-nacelle, power plant including engine and reduction gearbox with rear dual concentric rotors. The latter allow horizontal thrust and vertical or inclined thrust corresponding to deflection between two-keel rudder and three-leg undercarriage. Rotor system with distributed thrust of different-size rotors in 2+3 configuration comprises smaller rotor mounted at rotary reduction gearbox, larger rotors mounted at first wings pylons and two smaller rotors arranged with their reduction gearboxes at second wing tips. Helicopter allows conversion of its flight configuration from five-rotor one into rotorcraft configuration or winged autogiro with single-rotor propulsion.

EFFECT: better weight efficiency, better transverse and longitudinal controllability.

2 cl, 3 dwg, 1 tbl