- A method for the integration of continuous J shaped spars in extended panels of composite material comprising the following steps: - laminating a plurality of layers of composite material, in particular preimpregnated carbon fibre, on a mould that defines a resting surface and copies the aerodynamic profile of the component to be made thus creating in this manner a stratified structure that has a different thickness, in particular a greater thickness at the areas that will have to support greater loads in use; - creating J shaped spars of composite material; each spar comprises an extended central portion, a base portion transverse to the extended central portion and an end appendix extending from a side of the extended central portion; - arranging each J shaped spar on a rectilinear support having at least one right triangle shaped portion so that the extended central portion of the spar is arranged to come into contact with the larger base side L B of the rectilinear support, the end appendix rests on a portion on the right side L R of the support and the base of the spar is free and facing downwards; - arranging the spars, carried by the respective rectilinear supports, on the stratified structure; - creating a vacuum bag closed with sealing seam on the polymerization mould along all of the peripheral areas external to the panel; the vacuum bag covers the stratified structure, the rectilinear support, the base portion, the central portion and the end portion of the J shaped spars; - creating holes in the vacuum bag at respective connection points made along each rectilinear support, each hole being surrounded by a sealing zone which maintains the tight seal of the vacuum bag; - coupling a supporting structure positioned on the mould, in an area external to the vacuum bag and provided with a plurality of hooking and adjusting elements with said mould; - connecting each hooking and adjusting element with a connection point; - adjusting the position of each hooking and adjusting element with respect to the supporting structure in order to position the rectilinear support in a direction parallel to the vertical so that the position of the end portion of the J shaped spar, with respect to the mould, corresponds to that foreseen by the design; - depressurizing the vacuum bag and arranging the mould and the supporting structure in an autoclave to perform a polymerization cycle of the resin and any adhesive so that the J shaped spars firmly solidify and adhere to the stratified structure in the position foreseen by the design. - laminating a plurality of layers of composite material, in particular preimpregnated carbon fibre, on a mould that defines a resting surface and copies the aerodynamic profile of the component to be made thus creating in this manner a stratified structure that has a different thickness, in particular a greater thickness at the areas that will have to support greater loads in use; - creating J shaped spars of composite material; each spar comprises an extended central portion, a base portion transverse to the extended central portion and an end appendix extending from a side of the extended central portion; - arranging each J shaped spar on a rectilinear support having at least one right triangle shaped portion so that the extended central portion of the spar is arranged to come into contact with the larger base side L B of the rectilinear support, the end appendix rests on a portion on the right side L R of the support and the base of the spar is free and facing downwards; - arranging the spars, carried by the respective rectilinear supports, on the stratified structure; - creating a vacuum bag closed with sealing seam on the polymerization mould along all of the peripheral areas external to the panel; the vacuum bag covers the stratified structure, the rectilinear support, the base portion, the central portion and the end portion of the J shaped spars; - creating holes in the vacuum bag at respective connection points made along each rectilinear support, each hole being surrounded by a sealing zone which maintains the tight seal of the vacuum bag; - coupling a supporting structure positioned on the mould, in an area external to the vacuum bag and provided with a plurality of hooking and adjusting elements with said mould; - connecting each hooking and adjusting element with a connection point; - adjusting the position of each hooking and adjusting element with respect to the supporting structure in order to position the rectilinear support in a direction parallel to the vertical so that the position of the end portion of the J shaped spar, with respect to the mould, corresponds to that foreseen by the design; - depressurizing the vacuum bag and arranging the mould and the supporting structure in an autoclave to perform a polymerization cycle of the resin and any adhesive so that the J shaped spars firmly solidify and adhere to the stratified structure in the position foreseen by the design.