Patent ID: 8607722

Claim:
An aerodynamic wind propulsion device for watercraft comprising an aerodynamic wing connected to a steering unit located below the aerodynamic wing via a plurality of tractive lines, at least one pair of active steering lines being connected to the aerodynamic wing at two points spaced apart from one another and being coupled to at least one drive unit at the steering unit, a tractive cable, a first end of the tractive cable being connected at the steering unit to at least two of the tractive lines and a second end of the tractive cable being connected to a base platform, the aerodynamic wing having an aerodynamic profile which generates an uplift force in the direction of the tractive cable when the airflow direction is about perpendicular to the tractive cable, two passive steering lines, wherein each of the two passive steering lines comprises a lower section and an upper section, wherein a second end of the lower section of each passive steering line is connected to a first end of the upper section of the respective passive steering line via a connecting member, wherein second ends of the upper sections of the two passive steering lines are connected to the aerodynamic wing at two points spaced apart from one another, and wherein first ends of the lower sections of the two passive steering lines are connected to each other to form a continuous passive steering line section passing through the steering unit in order to passively follow a deformation of the aerodynamic wing induced by steering forces applied to said at least one pair of active steering lines.