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This is Fig. 11 from the 2013 GENOPT paper1. Fig. 11 Optimized design of the long propellant tank with two sets of struts, aft and forward, with 2 pairs of struts in each of these two sets. This is the aft set of 2 strut pairs. Notice that the struts penetrate the propellant tank. In the work reported here no constraint was introduced to avoid clearance problems of this type. Also, notice that the configuration appears to be “softer” with regard to lateral or pitching motions in the vertical direction in the plane of the paper than with regard to motions in the horizontal direction in the plane of the paper. The GENOPT/TANK software, in particular the addition of spring supports to the BIGBOSOR4 capability [14], is valid only if the “ring” of springs at each axial location forms a support stiffness that is essentially isotropic in the plane of the “ring”. Therefore, it is not valid to optimize a tank/strut system with less than three pairs of struts at each axial location in the propellant tank.
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