Abstract: A guide vane 100 is provided in which sheet portions 14, 15 are secured together to define an aerofoil profile 11. Between ends 20, 21 of the guide vane 100 there is a non linear variation in the maximum chordal thickness 13. Thus, greater maximum chordal thickness 13b in central portions of the guide vane 100 provide stiffness while ends 20, 21 which are generally formed from solid material have a smaller maximum chordal thickness such that a stiffer vane 100 can be provided with reduced material weight and therefore costs.