Patent ID: 8147209

Claim:
A wind turbine operable by pitch regulation and variable rotor speed, comprising at least one wind turbine blade longer than 30 meters, where a combined radius specific solidity Sol r is below a linear interpolation between: Sol r =0.035 at blade radius r=30% of the rotor radius R Sol r =0.025 at blade radius r=50% of the rotor radius R Sol r =0.018 at blade radius r=70% of the rotor radius R Sol r =0.011 at blade radius r=90% of the rotor radius R, for at least 50 radius-% of the blade(s) between blade radius r=30-90% of the rotor radius R, where the maximum lift coefficient C L,max >1.45 for a Reynolds number Re=1.5×10 6 .