FIELD: aviation. SUBSTANCE: blade profile includes upper surface 2 and inner surface 3 between leading edge 1A and trailing edge 1B; convexity of these surfaces defines locus. According to present invention, magnitude of ratio of maximum convexity to thickness varies linearly with relative thickness of profile 1 and ranges from 0.13 to 0.19 for relative thickness of 7% of chord C and from 0.18 to 0.24 for relative thickness of 15% of chord C. EFFECT: improved working characteristic at low lift and high Mach numbers. 8 cl, 13 dwg, 7 tbl
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