Patent ID: 8100661

Claim:
A wind turbine rotor blade, comprising: a root end by which the blade can be fixed to a rotor hub; a tip end located opposite the root end; a leading edge extending from the root end to the tip end; a trailing edge extending from the root end to the tip end; a span direction defined by a line extending linearly from the root end to the tip end; a chord direction perpendicular to the span direction and which lies in the plane extending through the leading edge and the trailing edge; a shoulder defined as the point of a maximum chord-wise extension; and an airfoil portion extending from the shoulder to the tip end, wherein the airfoil portion comprises a span-wise interval beginning before the tip end and extending to or close to the tip end and in which the distribution of the chord-wise extension is increased as compared to the load optimised distribution of the chord-wise extension, wherein the span-wise interval begins at or after 80% of the span-wise extension of the rotor blade as measured from the root end, wherein the distribution of the chord-wise extension of the airfoil portion is constant in at least a part of said span-wise interval, and wherein the cord-wise extension of the airfoil provides aerodynamic damping.