How the wing works

A tailwind fills the sail and propels the yacht forward (advance). Part of the pressure escapes through the opening in the sail behind which the wing has been fitted in such a way that the air flows past above and below it. Thanks to the shape of the wing and the angle at which the air flows towards it (with the angle optimised for efficiency), the air on the surface of the wing accelerates faster than the air beneath it. Low pressure then forms on the surface which literally sucks the wing upwards and stabilises it (lift).

The wing lift achieves two essentials effects: Firstly the pressure on the bow is minimised. And secondly the propulsion is increased because the wing's optimised angle of efficiency is designed so that the loss of propulsion caused by the opening is completely compensated for.