US Patent 9050786 Method of manufacturing an elongated composite structure

A method of manufacturing an elongated composite structure having two separate longitudinal composite structure sections, where said method comprises the following steps: providing a rigid mold part 13 having a first forming surface 14 with a contour defining an outer surface of the elongated composite structure, arranging a first fiber lay-up 15 in a first longitudinal section 16 of the first mold part 13, arranging a first flexible foil 18 over a first crosswise edge area 17 of the first fiber lay-up 15, arranging a second fiber lay-up 20 in a second longitudinal section 21 of the mold part 13 so as to overlap the crosswise edge area 17 of the first lay-up 15 and thereby the first flexible foil 18 in an overlap area 22 forming an interface between the fiber lay-ups 15,20, providing polymer to the fiber lay-ups 15,20 and allowing the polymer to cure.