Patent ID: 8899923

Claim:
A wind turbine blade comprising: a blade body extending in a longitudinal direction from a root portion to a tip portion and defining an aerodynamic airfoil cross section extending in a chordwise direction transverse to the longitudinal direction, one or more devices for modifying the aerodynamic surface or shape of the blade in an area of a portion of the trailing edge of the blade, and one or more activation mechanisms for controlling the position and/or movement of said device; said device being movably connected to the blade body and being at least partly divided into a number of sections by interstices or connecting portions having higher elasticity than said sections, the interstices or connecting portions extending at least partly through a thickness of the device from a trailing edge of said device and in said chordwise direction, such that the overall longitudinal bending flexibility of the device is increased, wherein the blade body has a trailing edge and the device is attached to the trailing edge of the blade body, said device being a trailing edge flap and a trailing edge of the flap forms at least part of the trailing edge of the wind turbine blade, wherein said trailing edge flap comprises a pressure skin and a suction skin and the interstices or connecting portions extend through a thickness of the flap between the pressure skin and the suction skin, and wherein a first one of the pressure and suction skins is secured to or integral with the blade body, and a second one of the pressure and suction skins is slidably movable with respect to the blade body.