Winglet for a wind turbine rotor blade

A rotor blade for a wind turbine, comprising:

• a blade body extending from a blade root towards a blade tip;
• a winglet body extending between a first end defined at an interface between the blade body and the winglet body and a second end defined at the blade tip and including a plurality of radial locations between the first and second ends, the winglet body extending in a chordwise direction between a leading edge and a trailing edge, the winglet body defining a chord and a twist angle at each of the plurality of radial locations generally in accordance with the values for chord and twist angle shown in TABLE 1, the chord being measured along a reference line extending between the leading and trailing edges of the winglet body, the winglet body further defining a pitch axis, the twist angle corresponding to an angle defined between a first reference line extending parallel to the chord and a second reference line extending through the pitch axis at a zero degree twist angle,
• wherein each of the values for chord shown in TABLE 1 may be varied +/−10% and each of the values for twist angle shown in TABLE 1 may be varied +/−1 degree.

A winglet for a rotor blade, comprising:

• a winglet body, the winglet body defining cross-sectional profiles at a plurality of radial locations along the winglet body generally in accordance with the values shown in TABLE 1, the cross-sectional profiles being joined so as to define a nominal shape of the winglet body,
• wherein the nominal shape lies in an envelope within +/−10% of each length value provided in TABLE 1, within +/−20 degrees of each cant angle value provided in TABLE 1 and within +/−1 degree of each toe angle and twist angle value provided in TABLE 1,
• wherein the length values correspond to a spanwise radius of the winglet body, a chord of the winglet body, a pitch axis of the winglet body, a sweep of the winglet body and a pre-bend of the winglet body.