FIELD: agriculture. SUBSTANCE: working tool has cylindrical drum 1 and blades 3 attached to outer surface of drum 1. Blades are mounted so as to form packs 4-8 and are arranged in equally spaced relation along drum 1. Peripheral edges 9-13 of blades 3 in each pack 4-8 are positioned remote from axis of drum 1 in coordinates of catenary line in accordance with equation: y=a ch(x/a), where y is coordinate of Y-axis, a is parameter of catenary line, x is coordinate of X-axis, ch is hyperbolic cosine. EFFECT: increased efficiency and enhanced reliability in operation. 5 cl, 2 dwg
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