FIELD: wind-power engineering. SUBSTANCE: windmill with vertical axis of rotation has shaft, wind turbine with horizontal cross-arms and vertical blades of aerodynamic profile coupled to it, additional blades mounted on wind turbine. Additional blades are mounted on cross-arms and are bent along arc of circle. Their vertical edges are located in plane passing through axis of cross-arms and convexity of each additional blade is directed towards side with convexity of corresponding blade of aerodynamic profile. EFFECT: increased functional reliability and efficiency. 4 cl, 3 dwg
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