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.