the rotor 10 as input signals the pitch controller 32 takes into consideration i a the signals from the wind sensor 26 and the speed sensor 28 as well as an output signal from the control unit 44 this being representative of the detected rotor imbalance or deformation of the respective blade in this way the pitch controller 32 uses the speed regulation and can in addition assist in the compensation of imbalances of the rotor 10 in this case a smoothing of the dynamics of the pitch is made possible by the described recycling of liquid into or from the tanks 34 the power supply of the rotating pump 40 is implemented preferably via a slip ring not shown in the configuration of the tank 34 that is shown in fig1 the supply discharge lines 36 are connected respectively to the end of the tank 34 that is far from the rotor hub 12 by which in the rotating rotor 10 not only the possibility of the liquid supply to the tanks 34 but also the possibility of the liquid discharge from the tanks 34 is ensured at all times since because of the centrifugal force liquid is always available at the end.