This is Fig. 12 from the 2013 GENOPT paper1. Shown here is a plan view of the optimized design of the AFT set of struts of the long propellant tank with two sets of struts, aft and forward, with 3 pairs of struts in each of these two sets. Notice that there is a small clearance problem at the end of the struts attached to the propellant tank. In the work reported here no constraint was introduced to avoid clearance problems of this type.
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