can be inherently added to the frame without detrimentally affecting the load carrying capacity of a composite frame indeed the entire frame can be fashioned to incorporate curvilinear or rounded shapes that would inherently increase the rigidity of the composite frame in such a curved design rigidity of the composite frame can be enhanced by virtue of the shape and contours of the upper and lower panels depending on the final design strategically placed contours may not only be aesthetically pleasing but also serve to increase the rigidity of the panel as one of the primary roles for the stringers is to increase a planar composite frame 39 s rigidity adding curvilinear surfaces to the composite frame can decrease the necessity for the incorporation of internal stringers or at least decrease the number of stringers included within the frame fig3 shows a composite frame according to one embodiment of the present invention having a plurality of curvilinear surfaces as with a planar composite frame an upper 34 and lower 30 panel are bonded using an adhesive material 31 33 to a core material 32 comprised of a integral combination of separator material honeycomb and one or more longitudinal strengthening members stringers 35 unlike a planar construction the stringers.