ABSTRACT
A wind turbine rotor consists of rotor blades mounted on a hub. Most commercial wind turbines have a three-bladed rotor. There are, however, turbines with two blades, and in fact also turbines with only one single blade. The advantage with fewer blades is that the weight of the rotor and also of many other components of the turbine will decrease. The share of the power in the wind that can be converted will decrease with fewer blades, but from an efficiency point of view the differences are negligible, or at least easy to compensate by increasing the length of the rotor blade a bit.
