The invention relates to the field of aviation engineering, namely to the constructional execution spar main rotor and tail rotor helicopters from composite materials. According to the utility model in the spar of the blade helicopter rotor, comprising a butt, a discontinuous and end portions made of a woven preform with variable cross section and wall thickness and an axis coinciding with the axis of the spar, impregnated with a polymeric binder and consisting of more than two layers of braid made with different braiding angles to the spar axis angles weaving on inboard, discontinuous and end sections are different and form: α 1 = ± 5 ° ... 25 °, α 2 = ± 10 ° ... 30 °, α 3 = ± 15 ° ... 40 °, where α 1 - braiding angle in the inboard portion; α 2 - braiding angle at the discontinuous portion; α 3 - braiding angle at the end portion, preferably inboard portion between layers of the braid with braid angle α 1 enter the braiding layers angle α 4 = ± 40 ° ... 50 °. The technical result - an increase operational stability of the helicopter rotor blade spar. 1 ZP f ly-4-yl.
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