FIELD: aeronautical engineering. SUBSTANCE: two extensible drum-type cycloid propellers are mounted on carriage on both sides of fuselage in its center. Propellers are provided with engines. When not in use, propellers are located in fuselage wells. They are not kinematically linked and each of them is mounted on its own carriage installed on guides. Carriages are moved apart or drawn together by means of loop ropes connected with reversible drives. EFFECT: enhanced reliability. 2 cl, 2 dwg
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