Patent ID: 7632068

Claim:
A wind turbine blade comprising: one or more shape deformable airfoil sections, wherein an outer surface of each of the shape deformable airfoil sections is substantially continuous in all of its shapes, wherein each shape deformable airfoil section comprises a substantially non-deformable part and one or more deformable parts, and actuator means for providing shape changes in the shape deformable airfoil sections, wherein the actuator means are(is) active means which provide(s) changes in shape by supplying said means with energy, wherein an outer surface of at least one of the deformable parts is defined by skin made of a flexible material, wherein the said skin is attached to the substantially non-deformable part, and wherein the actuator means is situated within the skin, or wherein at least one of the shape deformable parts is made of flexible material(s), wherein the actuator means is(are) an extendable beam(s) extending within the flexible material(s), and the extendable beam(s) is(are) made from a material composition(s) which elongation(s), shortening(s) and/or bending(s) is (are) controllable by applied electrical current(s).