Abstract: One or more blades for a wind turbine have at least one guide vane (20) having a vane leading edge (22) and vane trailing edge (23), arranged in such that the guide vane (20) is substantially placed over a blade surface (8) of a suction side (16) of the blade (1) and extends in longitudinal direction (5) at least partly along the surface (8) of the root segment (12), wherein a line between the vane leading edge (22), the longitudinal axis (5) of the blade (1) and the chord (3) form at least one starting angle (?), and further wherein a second starting angle (?II) in the transition portion (14) is greater than a first starting angle (?I) in the plain portion (13) and less than a third starting angle (?III) in the profiled portion (15).

Abstract: One or more blades for a wind turbine have at least one guide vane (20) having a vane leading edge (22) and vane trailing edge (23), arranged in such that the guide vane (20) is substantially placed over a blade surface (8) of a suction side (16) of the blade (1) and extends in longitudinal direction (5) at least partly along the surface (8) of the root segment (12), wherein a line between the vane leading edge (22), the longitudinal axis (5) of the blade (1) and the chord (3) form at least one starting angle (?), and further wherein a second starting angle (?II) in the transition portion (14) is greater than a first starting angle (?I) in the plain portion (13) and less than a third starting angle (?III) in the profiled portion (15).

Abstract: A rotor for a wind turbine, having a diameter of 50 metres or more, has a blade with at least two blade sections in the lengthwise direction of the blade, where at least one blade section has a curvature along the blade and relative to a second blade section, where said curvature results in the tip end of said blade being offset (x) relative to the axis of the blade root. A ratio (x/L) of the offset (x) relative to a distance (L) from the tip end of the blade to the blade root is between 0 and 0.1.