FIELD: mechanical engineering; fans. SUBSTANCE: invention relates to blade to be fastened on fan hub. Blade is made of composite plastic-based material with reinforcement fibers. Base of blade has metal ring with rotor blade-to-hub fasteners. Cross-section area of ring hole increases in direction of blade periphery. Rigid reinforcement member is installed in ring hole. Composite material gets into ring, and reinforcement fibers in rotor blade base pass in ring hole between reinforcement member and wall of hole, practically, parallel to wall. EFFECT: provision of high operation reliability. 7 cl, 4 dwg
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