Patent ID: 8087888

Claim:
A wind turbine having at least a blade which comprises a first component ( 11 ) having an aerodynamic profile with a leading edge ( 5 ), a trailing edge ( 7 ), and suction and pressure sides between the leading edge ( 5 ) and the trailing edge ( 7 ), and a second component ( 13 ) attached to the trailing edge ( 7 ) and/or to the leading edge ( 5 ) of the first component ( 11 ) in at least a part of the blade, wherein: the second component ( 13 ) comprises an upwards and/or downwards deflectable flap ( 15 ) that allows changing flow over the blade; the blade further comprising a means for deflecting the deflectable flap ( 15 ) which comprise a stiff plate ( 31 ) inserted between the first component ( 11 ) and the flap ( 15 ) and stiff plate actuating means ( 33 , 43 ) located in the first component ( 11 ) and actuated by vacuum and/or pressure.