The invention relates to a wind power rotor having at least one rotor blade which can be pivoted over a range of flapping angles limited by stops and for the purpose of setting the angle of incidence is connected to the rotor shaft or rotor head such that it can rotate about its longitudinal axis. In this arrangement, a variable limitation of the flapping angle is achieved according to the invention by constructing the stops to be adjustable and providing them with an assigned control system which is active while the rotor rotates and varies the range of flapping angles in terms of position and magnitude by appropriate setting of the stops. In this way, the range of flapping angles limited by the stops closely tracks the flapping vibration zone of the rotor blades which is determined by dynamic loads, and each rotor blade is locked in an impact-resistant manner in a prescribed angular position when the rotor blade comes to rest and starts up.
