Patent ID: 8087889

Claim:
A wind turbine having at least a blade comprising a first component ( 11 ) having an aerodynamic profile with a leading edge, a trailing edge, and suction and pressure sides between the leading edge and the trailing edge, and a second component ( 13 ) attached to the trailing edge and/or to the leading edge 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 a flow over the blade; the deflectable flaps ( 15 ) are deflected by fluid inflatable means ( 23 ) placed in a flap inner chamber ( 25 ) close to the first component ( 11 ); the wind turbine comprises means ( 24 ) for controlling said fluid inflatable means ( 23 ) depending on a wind situation and/or the blade loads; and the fluid inflatable means are two flexible tubes ( 23 ) extending along, the flap ( 15 ) in a spanwise direction, one of the two flexible tubes being configured for deflecting the flap ( 15 ) upwards, and an other of the two flexible tubes for deflecting the flap ( 15 ) downwards.