MULTI-SCREW UNMANNED ROTORCRAFT Russian patent published in 2017 - IPC B64C27/22 

FIELD: aviation.

SUBSTANCE: multi-rotor unmanned rotorcraft comprises screws in the annular ductings positioned at all-movable panels of the wing, rotors, gas turbine engines and transmission gear including reducing gear box system with shafts rotating the rotors and screws in the annular ductings. The multi-rotor unmanned rotorcraft is designed using a modularized circuit with a tandem arrangement of the front and rear triple-screw systems made with a piggybacking of different-sized screws, each of the triple-screw systems includes a larger rotor and a high-mounted wing with the screws in the annular ductings below it. The multi-rotor unmanned rotorcraft has the ability to transform the in-flight configuration from a helicopter wiht twin-screw tandem configuration or sextuple-screw fore-aft configuration into winged autogyro or rotorcraft with a tandem arrangement of wings with a twin- or quadruple-screw propulsion system. The rear rotor is mounted without overlapping and mutual interference with the front rear and positioned above it at the fore part of vertical tail tip having engines on either side of it at rear over-the-wing pylons, each of the engines is designed with the front output of the shaft for power extraction.

EFFECT: reduction of drag power for hovering trim, improvement ofhandling in roll and in pitch.

3 cl, 1 dwg