Patent ID: 8740153

Claim:
An aerodynamic wind propulsion device, comprising: an aerodynamic wing ( 10 ) being connected to a steering unit ( 20 ) located below the aerodynamic wing via a plurality of tractive lines, a tractive cable ( 40 a, b ), a first end of the tractive cable being connected to the steering unit ( 20 ) and a second end of the tractive cable being connected to a base platform, the aerodynamic wing ( 10 ) having an aerodynamic profile which generates an uplift force in the direction of the tractive cable ( 40 a, b ) when the airflow direction is about perpendicular to the tractive cable, wherein at least two of said plurality of tractive lines have elastic behavior in a load range occurring in use of the aerodynamic wind propulsion device and the elastic behavior of said at least two tractive lines is different; and wherein at least one of said tractive lines has elastic properties which are different from other tractive lines to effect a deformation of the aerodynamic wing element in a first load condition to produce at least one of the following effects: to decrease the uplift forces generated by the aerodynamic wing, to increase the air drag generated by the aerodynamic wing and to establish an optimum aerodynamic shape in a second load condition to generate a maximum uplift force and/or minimum air drag by the aerodynamic wing; said at least one tractive line having elastic properties which are different from the other tractive lines is coupled to a section of the aerodynamic wing to effect a deformation of said center section in the first load condition such that the aerodynamic profile in the first load condition has a cross section that is different from an ideal aerodynamic wing cross section.