FIELD: aircraft engineering.
SUBSTANCE: propeller (5) blade (20) comprises top surface (21) and bottom surface (22) extending crosswise from leading edge (23) to trailing edge (24) and, in sweep, from root section (31) to free end section (41). Blade (20) comprises root zone (30) and bulged zone (35) extending from root section (31) to free end section (41). Said bulged zone (35) comprises bulged bottom surface (22'') and top surface (21'') from leading edge (23) to trailing edge (24) to extend from root section from principal plane (P1) in direction (Z) parallel with blade pivot pin and in direction opposite the airflow direction via the blade to the point of maximum flexure and towards said principal plane (P1).
EFFECT: decreased noise in propeller operation.
18 cl, 7 dwg
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