Patent ID: 8517682

Claim:
A wind turbine blade having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge, the blade including a blade body and one or more shape modifiable air foil sections in the area of the trailing edge of the blade, each of the one or more shape modifiable air foil sections having a pressure skin and a suction skin, the suction skin being secured to or integral with the blade body, and the pressure skin being slidably movable with respect to the blade body, the blade further including an actuator for applying a force to one of said skins that causes said pressure skin to slide with respect to the blade body, so as to thereby modify the airfoil shape of the trailing edge, wherein at least 10% of the length of the trailing edge, when measured from a tip portion to a hub portion of the blade, is shape modifiable, and wherein the shape modifiable portion of the trailing edge is closer to a tip portion of the blade than to a hub portion thereof.