The aerodyne in form for instance of a flat plate, an airfoil or a sail, mounted into a frame, is attached on a mast by ropes, runs upward with positive angle of attack, downward with negative angle and produces energy in both phases, as it does in concept 2. A rudder aligns the aerodyne into the wind direction. Several solutions are feasible. One with a sail, which can curve upward and down forming a profile similar to an airfoil, has been designed and tested in several versions. The fig. 5 shows the schematic design, fig 6 to 9 some of the practically built up versions.