Aerodynamic wind energy conversion device, particularly for watercraft, comprising - an aerodynamic wing with an aerodynamic profile; - a steering unit located below the aerodynamic wing; - at least a first tractive line and a second tractive line; wherein the first end (310b, 320b) of each of the two tractive lines is connected to the steering unit, and the second end of the first tractive line is connected to a first line connection point located at the aerodynamic wing, and the second end of the second tractive line is connected to a second line connection point located at the aerodynamic wing; - a tractive cable, a first end of the tractive cable being connected to the steering unit and a second end of the tractive cable being connected to a base platform; - at least a first and a second reefing point (510,520) located across the aerodynamic wing such that the shape of the aerodynamic wing can be controlled via at least one reefing line guided through the first and/or second reefing point (510, 520); characterized in that - the first tractive line has a length extending from a common base reference point, preferably the first end of the first tractive line or the base reference point (401 to the second end of the first tractive line at the first line connection point located at the aerodynamic wing, and the second tractive line has a length extending from the common base reference point, preferably the first end of the second tractive line or the base reference point, to the second end of the second tractive line at the second line connection point located at the aerodynamic wing; wherein the length of the second tractive line is shorter than the length of the first tractive line; and - wherein the first reefing point is related to the first line connection point and spaced from the first line connection point in a first reefing distance and the second reefing point is related to the second line connection point and spaced from the second line connection point in a second reefing distance, such that the second reefing distance is longer than the first reefing distance. - an aerodynamic wing with an aerodynamic profile; - a steering unit located below the aerodynamic wing; - at least a first tractive line and a second tractive line; wherein the first end (310b, 320b) of each of the two tractive lines is connected to the steering unit, and the second end of the first tractive line is connected to a first line connection point located at the aerodynamic wing, and the second end of the second tractive line is connected to a second line connection point located at the aerodynamic wing; - a tractive cable, a first end of the tractive cable being connected to the steering unit and a second end of the tractive cable being connected to a base platform; - at least a first and a second reefing point (510,520) located across the aerodynamic wing such that the shape of the aerodynamic wing can be controlled via at least one reefing line guided through the first and/or second reefing point (510, 520); - the first tractive line has a length extending from a common base reference point, preferably the first end of the first tractive line or the base reference point (401 to the second end of the first tractive line at the first line connection point located at the aerodynamic wing, and the second tractive line has a length extending from the common base reference point, preferably the first end of the second tractive line or the base reference point, to the second end of the second tractive line at the second line connection point located at the aerodynamic wing; wherein the length of the second tractive line is shorter than the length of the first tractive line; and - wherein the first reefing point is related to the first line connection point and spaced from the first line connection point in a first reefing distance and the second reefing point is related to the second line connection point and spaced from the second line connection point in a second reefing distance, such that the second reefing distance is longer than the first reefing distance.