A method of manufacturing fiber-reinforced parts, such as blades, for wind power plants, whereby a number of layers (10) of material comprising fiber, such as glass fiber mats, are arranged on a curved surface (5) of an elongated (5) open mold (1) wherein each layer (10) of material is arranged on said curved surface (5) as pre-shaped mats (10) having a form substantially corresponding to an intended area of application such that any need for further modification of or cutting in said material is substantially eliminated.