Patent ID: 8419363

Claim:
A deformable trailing edge blade section for a wind turbine blade, at least part of said deformable trailing edge blade section being formed from a deformable material, said deformable trailing edge blade section comprising: a trailing edge; and cavities in connection with or connectable to a fluid source in a way that allows fluid to flow from the fluid source to the cavities, so that a shape of the deformable trailing edge blade section and thereby a camber of the blade cross-section is changeable by a pressure of fluid in the cavities with insignificant changes in thickness and chord-wise length of the deformable trailing edge blade section, wherein a length of the deformable trailing edge blade section in a chord wise direction is between 1 and 30%, and wherein the cavities are offset from a camber line of the blade cross-section so that alteration of the pressure of fluid in the cavities results in bending of the deformable trailing edge blade section and thereby movement of the trailing edge.