Blade for a water current turbine rotor, water current turbine comprising such a blade, associated water current turbine and method for producing such a blade

A rotor for a marine turbine, the rotor comprising:

• an inner ring configured to revolve around a longitudinal axis, the inner ring having a first diameter;
• an outer ring configured to revolve around the longitudinal axis, the outer ring having a second diameter that is greater than the first diameter;
• and
• at least one blade extending in a radial direction between the inner ring and the outer ring, the at least one blade having a leading edge positioned upstream following a direction of the water flowing along the at least one blade, and a trailing edge positioned downstream following a direction of a flow of water along the blade,
• wherein at least one portion of the at least one blade, in a transverse section according to a cross-section thereof, has a profile with a thick part and a thin part, in which a length of a curve of the thin part is between 0.1 times a length of a cord between the leading edge and the trailing edge and 0.9 times the length of the cord inclusive, wherein a maximum thickness of the thick part is less than or equal to 0.25 times the length of the cord between the leading edge and the trailing edge, and the thick part has a plane of symmetry which is parallel to the radial direction such that respective curves of the outer surface and the inner surface of the thick part are symmetric along an entire length of the thick part.