FIELD: hydraulic engineering. SUBSTANCE: concentric rims are joined with hub and together by radial spokes. Blades are mounted in concentric rows for limited two-sided turn about spokes. Arc length of external end surfaces of blades in each row are equal. Blades have sinusoidal cross-sectional areas. Spokes are arranged along sinusoid axis. EFFECT: improved design. 2 cl, 4 dwg
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