FIELD: aviation.
SUBSTANCE: propeller blade (34) extends radially between inboard portion (38) and the tip (36) and comprises a front edge (40) and a rear edge (42), as well as a lower side and an upper side. Along the front edge (40), between the blade radial direction corresponding to the radial direction of the propeller, on which the blade is to be mounted from one side and on another side tangent to the front edge the angle (α) passes over local maximum zmax, which is between 60 and 80% of blade height (34). The upper side of the blade (34) comprises a reinforcing portion (54) with a concave surface that extends axially from the front edge (40) to the rear edge and located at blade (34) height between the local maximum zmax and the blade (34) tip.
EFFECT: increased traction coefficient of propeller blade efficiency in the entire range of functioning and limitation of harmful acoustic effects.
8 cl, 8 dwg
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