Abstract: A wind turbine blade comprising an aerodynamic fairing supported along at least a portion of its axial length by a spar (12). The spar comprises at least two spar segments (12) joined end-to-end at an interface (9), each spar segment comprising a shear web (3) with a spar cap (4) on each side. The outer face (6) of each spar cap tapers inwardly towards the interface such that its depth is reduced towards the interface creating a recess on each side of the interface formed by the tapered faces of adjacent spar caps. A respective connection piece (8) is sized to fit into each recess. Each connection piece (8) is sized to fit into each recess. Each connection piece (8) being fixed to the tapered faces of adjacent spar caps to form a double scarf joint.

Abstract: A blade for use in water, the blade comprising an outer shell of fibre reinforced plastic defining a cavity. A substantial portion of the cavity is filled with a resin which adheres to the inner wall of the shell.

Abstract: A method for connecting adjacent parts (1A, 1B) of a wind turbine fairing. Two parts are abutted together to define an adhesive channel (14) between the two parts and a pair of spacers (12, 13). Adhesive is injected into the channel. One of the parts is provided with a stop (16) on a surface which is internal to the fairing allowing the two parts to be located correctly with respect to one another.