HELICOPTER Russian patent published in 2001 - IPC

FIELD: vertical take-off flying vehicles. SUBSTANCE: proposed helicopter includes fuselage, engines, crew cabin, first circular rim, second circular rim with main rotor blades articulated in it, transversal and longitudinal suspension points, control and horizontal thrust rotors, mechanism for simultaneous and alternating change of main rotor blades angle which is movably secured on shield of first circular rim; it includes rim for simultaneous blade angle with swinging mechanism secured on it; it also includes inner ring-crank. EFFECT: enhanced controllability of helicopter. 12 cl, 2 dwg