The trianular Warren truss, shown in Figures 11-43 and 11-44, combines two simple planar trusses to form the shape of a trianguler prism. The truss has two lower beams but only one upper beam, which makes it weigh less than the regular warren truss, though its construction requires additional connectors (red in the illustration and in Figures 11-43 11-44). This variant is nearly as robust as the regular Warren truss, except that its lower beams are subjected to more stress than the upper beam. Also pressure on the upper beam can push the two lower beams apart unless they are connected (by perpendicular plates, for example).