Abstract: A bulkhead assembly for a wind turbine blade is described, where the bulkhead is substantially formed from a flexible sheet material. In one aspect, the flexible sheet material can be attached to the larger assembly using a releasable connection, e.g. a zipped connection, to allow for relatively easy installation and removal, e.g. for repair or other service operations. At least a portion of the sheet material may be transparent, to allow for easy inspection of the interior of the wind turbine blade. In one aspect, the bulkhead assembly is arranged to couple to, or is formed integrally with, the root flange of a wind turbine blade. The use of such a flexible material to form the blade root end bulkhead allows for ease of handling and manufacturability over prior art systems.

Abstract: The invention relates to a wind turbine blade and a transitional shell blank for the manufacture of the shell of a wind turbine blade, the blade or the transitional shell blank being made of fibre-reinforced polymer including a first type of fibres (1, 3, 6) of a first stiffness and a first elongation at breakage, and a second type of fibres (2, 5, 7) of a different stiffness and a different elongation at breakage. According to the invention the two types of fibres are distributed in the polymer matrix. When seen in a sectional view perpendicular to longitudinal direction of the blade or the transitional shell blank, the quantitative ratio of the two types of fibres varies continuously in the longitudinal direction of the blade or of the transition shell blank.