MULTIROTOR CONVERTIBLE HIGH-SPEED HELICOPTER (MCSH) Russian patent published in 2015 - IPC B64C37/00 

FIELD: aircraft engineering.

SUBSTANCE: claimed helicopter comprises the engines with PTO-shaft rear output mounted in nacelles ahead of the rear wing atop the fuselage and three-leg undercarriage. This MCSH is configured to a twin-boom design with tandem wings spaced apart at pylons and fuselage end of five-rotor system with distributed thrust of different-size rotors (DSR) configured to DSR-X3+2 design with three rotors at leading wing ends and thin boom, hence, two front rotors and one rear rotor. Note here that two smaller rotors on rear wing pivoting parts feature vectored thrust. Helicopter allows conversion of its flight configuration from five-rotor one into rotorcraft configuration or winged autogiro with two-rotor propulsion. Rear wing smaller rotors develop the cruising thrust for cruising flight, vertical and shorter takeoff at overload at spinning rotors in windmilling mode developed by approach flow or in the mode approximating to motored autorotation.

EFFECT: higher useful load ratio, better longitudinal and transverse controllability.

3 cl, 1 dwg