Segmented wind turbine blade

The present invention relates to a segmented blade of the wind turbine. Specifically, to a rotor for a wind turbine blade (10) comprises a plurality of individual blade segments (12), wherein each blade section defining an internal passage between the longitudinal ends of the blade sections extends (22 ). A rigid spar member (28) extending longitudinally through the interior passage of the individual blade segments such that the blade sections are aligned on the spar member and connected end to end to define a complete rotor blade (10). The spar member has a keyed cross-sectional profile to the cross-sectional profile of the blade section of the internal passage. Spar (34, 36) of the spar member comprises oppositely facing, the spar (34, 36) engage the blade segments against the inner surface of the internal passage.