The design relates to a fluid dynamic actuator, composed of a rectangular box-like body that presents a graduated knob on the top, the knob being located at the top of a raised central portion of the top of the box-like body; frusto-conical caps are present at each end of the box-like body.
The box-like body is shaped so as to present longitudinal ribs at the center of the sides that extend along the whole length of the sides and accommodate, at each end, one screw of the end caps.