paragraphs the primary purpose of the stringers is to stiffen the panels made of a composite material therefore it is also appropriate to compare a panel 51 stiffened with this type of stringers 11 with a panel 51 stiffened with conventional stringers 53 as illustrated in fig1 and 13 being able to observe that depending on the type of failure mode affecting the stringer and panel assembly the weight savings that can be obtained with this type of stringers 11 in comparison with conventional t shaped stringer and panel assembly varies when the type of failure mode affecting the stringer and panel assembly is mainly due to general buckling or resistance a weight reduction of about 10 15 can be obtained in contrast when the main type of failure mode affecting the stringer and panel assembly is local buckling of the panel the weight reduction is less in this type of failure mode the foot of the stringer 15 is supporting the panel and the inertia and rigidity ei are not as important therefore in the areas in which the failure mode is due to local buckling of the panel it is advisable to add a supplement 57 on the foot 15 of the stringer.