Patent ID: 7931444

Claim:
A wind turbine comprising a rotor with wind turbine blades each having a root end connected to a hub of the wind turbine and a tip end, the tip end of each of which being equipped with a winglet extending a distance in a direction perpendicularly to a longitudinal direction of the blade, wherein a combined radius specific solidity of the rotor at the tip end of the blades immediately adjacent the winglet is 0.085 times an extension of the winglet divided by a radius of the rotor plus a value within the range of 0.0012 and 0.0048, plus, the combined radius specific solidity of the rotor being defined as Sol r = n · c r 2 ⁢ π ⁢ ⁢ R n being a number of blades in the rotor, C r a chord length at a distance r from the hub and R the radius of the rotor.