Windtracker twin-turbine system

A turbine system for wind or water power, comprising two radial turbines, wherein

• the radial turbines comprise a rotor which can rotate about a shaft and which comprises one or more turbine blades, the turbine blades being orientated parallel to the rotor, the turbine blades being arranged within a cylindrical shell that is arranged concentrically about the shaft and has an external radius R1 and an internal radius R2,
• the internal radius is
• R2=f1×R1
• where f1=0.19 to 0.32,
• each turbine blade has a first region which extends from the internal radius R2 to the external radius R1, is curved towards the shaft, and has a radius of curvature
• R3=f2×R1
• where f2=1.2 to 2.4, and
• a second region, which is externally adjacent to the first region, is positioned on the outside of the cylindrical shell, and has a curvature towards the shaft, the curvature pointing to the same side as the curvature of the first region, the radius of curvature R4 of the second region being
• R4=f3×R1
• where f3>0.7,
• the second region is of a width
• B2=f8×R1
• where f8=0.11 to 0.19, and
• two radial turbines, orientated parallel side by side, are arranged with a vertical rotation shaft, are interconnected, and are pivotable about a pivot shaft parallel to the turbine shafts, the pivot shaft and a V-shaped wind splitter being positioned outside the line connecting the turbine shafts and both being on the same side of the connecting line.