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Wind turbine blade comprising a spar, a plurality of ribs rotatably mounted on said spar, and a rotating means adapted to rotate at least two consecutive ribs independently of each other. The blade can thus be operated so as to rotate at least two consecutive ribs independently of each other, althou

Wind turbine blade comprising a spar, a plurality of ribs rotatably mounted on said spar, and a rotating means adapted to rotate at least two consecutive ribs independently of each other. The blade can thus be operated so as to rotate at least two consecutive ribs independently of each other, although it is also possible to jointly rotate all the ribs.

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1. A wind turbine blade comprising: a spar,a plurality of ribs rotatably mounted on the spar,a flexible cover supported by the spar and the ribs, the flexible covering extending continuously over the ribs and defining a pressure side surface and a suction side surface of the blade, andan individual

1. A wind turbine blade comprising: a spar,a plurality of ribs rotatably mounted on the spar,a flexible cover supported by the spar and the ribs, the flexible covering extending continuously over the ribs and defining a pressure side surface and a suction side surface of the blade, andan individual rotating means disposed at each of the ribs, the rotating means comprising an actuator for each rib, wherein each actuator independently actuates a single rib such that the cover can be continuously twisted between two or more of the ribs without a discontinuity in the cover, wherein the flexible cover comprises a first portion corresponding to the pressure side of the blade and a second portion corresponding to the suction side of the blade, such that the first and second portions are merged at a leading edge region of the blade and are removably attached to each other at a trailing edge region of the blade. 2. The wind turbine blade according to claim 1, wherein the rotating means comprises a plurality of gears. 3. The wind turbine blade according to claim 1, wherein at least one actuator is engaged to a corresponding rib by means of a bevel gear. 4. The wind turbine blade according to claim 1, wherein the spar is tubular. 5. The wind turbine blade according to claim 1, wherein the spar has a rectangular cross-section. 6. The wind turbine blade according to claim 1, wherein the spar comprises at least two longitudinal parts. 7. The wind turbine blade according to claim 1, wherein the flexible cover is fastened to at least some of the ribs. 8. The wind turbine blade according to claim 1, wherein the flexible cover comprises at least two parts. 9. The wind turbine blade according to claim 1, comprising a stiffening element arranged at a trailing edge region of the blade extending between at least two of the ribs. 10. A wind turbine comprising a blade according to claim 1. 11. A method of operating a wind turbine blade according to claim 1, comprising the step of rotating at least two consecutive ribs independently of each other. 12. The method according to claim 11, comprising the step of jointly rotating at least two consecutive ribs. 13. The wind turbine blade according to claim 4, wherein the spar has a rectangular cross-section. 14. The wind turbine blade according to claim 4, wherein the spar comprises at least two longitudinal parts. 15. The wind turbine blade according to claim 5, wherein the spar comprises at least two longitudinal parts.