AIRFOIL Russian patent published in 2014 - IPC B64C27/46 

FIELD: transport.

SUBSTANCE: invention relates to aircraft engineering, namely, to blades of propeller screws. Airfoil has primary section of its profile. Besides, it has inner root section over airfoil span whereat airfoil is attached to bearing structure. Besides, it gas end section at extreme end over span, outside said main section behind the line of its connected with end section, End section comprises end frame configured in first Bezier curve constructed by four reference points P1-P4. Said reference points are located over the edges of polygon constricting said end section. Reference point P1 is located at airfoil leading edge at connection of the main section with end section and is located with respect to span between 93.5%R and 95.9%R. Reference point P2 is located on second side at position between 30% and 80% along second side from P1. Reference point P3 is located at third side at position between 30% and 90% along third side from the point whereat cross second and third sides. Reference point P4 is located at extreme point of end edge at trailing edge of airfoil.

EFFECT: improved aerodynamic properties of screw propeller.

31 cl, 13 dwg