portion 20 of a stiffening member ridge 12 specifically as shown in fig6 this additional ply 26 u2032 is affixed to the base portion 20 and is positioned substantially at the distance u201c h u201d from the unidirectional ply 26 on base layer 18 consequently the ply 26 and the ply 26 u2032 will alternatively resist tension forces that are imposed during a bending of the panel 10 with the exception of the additional unidirectional ply 26 u2032 the ridge 12 that is shown in fig6 is similar in all other important respects to the ridge 12 shown in fig2 although the disclosure above has been directed primarily to a single ridge 12 it is to be appreciated that the disclosure applies equally to all ridges 12 14 of the reinforced panel 10 moreover for all embodiments of the present invention i e ridges 12 shown in fig2 4 5 and 6 the construction material for the base panel 18 and for the ridges 12 14 is a composite material preferably this composite material is a combination of carbon fibers and epoxy resin also for all embodiments of the present invention it is intended that after the composite material components have been assembled as disclosed above the entire combination is co cured the consequence of this.