Blade spar

Abstract

A blade spar for a rotor blade for a rotor of an aircraft or vessel, preferably wherein the rotor is a propeller, the blade spar comprising a laminate structure. The laminate structure includes a plurality of plies of fibres in a matrix, wherein the blade spar has generally a longitudinal axis defining a longitudinal direction, the longitudinal axis extending along a radial direction of the rotor. The blade spar includes at least a portion that is curved from the longitudinal axis, wherein the plurality of plies comprises a first ply comprising a plurality of first fibres, wherein an alignment of the first fibres varies along the longitudinal direction to align the first fibres to the curved blade spar.

Dependencies are inferred from the claim text.