HELICOPTER Russian patent published in 1999 - IPC

FIELD: aeronautical engineering. SUBSTANCE: helicopter has fuselage with crew cabin in nose portion, engines, main rotor whose blades are secured on hub revolving on shaft, first circular rim articulated on fuselage and second circular rim connected with blades by means of struts and mechanically linked with shafts of engines. Second circular rim is thrown into engagement with first circular rim; it is engageable with first rim by means of rolls. Shafts of first rim are articulated on fuselage, engines being secured on these shafts. EFFECT: increased load-lifting capacity; improved mechanical and aerodynamic properties. 5 cl, 1 dwg