Patent ID: 8568103

Claim:
A wind turbine rotor blade with a suction side and a pressure side, comprising: a cylindrical root portion; an airfoil portion defining the suction side and the pressure side; and a transition portion located between the airfoil portion and the root portion and which has a transition profile changing from the airfoil of the airfoil portion to the cylindrical profile of the root portion, wherein a maximum chord length of the airfoil portion is at least a maximum chord length of the transition portion, wherein the transition profile comprises a section with a concave curvature on the pressure side of the rotor blade, wherein a leading section of the transition profile is cylindrical and a trailing section of the transition profile is elongated, and wherein the section with the concave curvature is formed as an area added to a cross section of the transition section profile as compared to a transition profile in which the curvature of the pressure side is symmetric about the chord to the curvature of the section side, the area is delimited by a straight line extending from the suction side in a perpendicular direction to the chord at 100% chord length.