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This is Fig. 1a from the 2013 GENOPT paper1. Fig. 1a Starting design of the long propellant tank with two sets of struts, aft and forward, with 4 pairs of struts in each of these two sets. Compare with the optimized configuration shown in Fig. 4. (NOTE: In this elevation view of the starting design only one of the four pairs of struts is displayed at each of the aft and forward axial locations. See Fig. 2 for the plan view of all four pairs of struts at the aft axial location and Fig. 3 for those at the forward axial location.) The GENOPT-user-created names of several of the decision variable candidates are given. These decision variable candidates are defined in Tables 1 and 2. The end domes of the propellant tank are 2:1 ellipsoidal shells in the particular cases described here, but may have any ratio of major to minor axes.
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