The wind-powered winch consists of rotors (1,2) with blades (3). It has at least two synchronously contra-rotating rotors. The blades extend radially in star pattern from the turning axis perpendicular to the wind direction. The turning areas encompassed by the rotors overlap, so the blades of one rotate partly within the turning circle of the other. Each rotor may have three or more blades. The coordinated rotation of the blades is such that each blade (3) forms a right angle with the blades of the others three times during the overlapping phase. The blades come as close as they possibly can to each other without touching.
