Abstract: A wind energy conversion apparatus comprising a supporting structure including a number of spokes, which is rotatably journalled on a horizontal main shaft, wherein auxilliary rotors having an at least substantially circular plane of inflow are mounted on the ends of the spokes, wherein each of the auxilliary rotors has a plane of inflow which includes an acute angle with the central axis of the main shaft and which intersects the central axis upstream of the main shaft, and wherein the auxilliary rotors are made up of rotors including rotor blades or of conical bodies having a large apex angle, whose base is directed towards the oncoming wind.