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from the 2013 GENOPT paper2. This and the next several slides pertain to the propellant tank with two supporting skirts.
Fig. 8a BIGBOSOR4 “twoskirt” model. This “twoskirt” model contains 38 shell segments. The points shown here lie on the shell reference surfaces. These points indicate only the end points of each shell segment in the model. Each shell segment contains many nodal points, as follows: 13 nodal points in each of Segments 1, 2, 4, 5, 6 – 17, 18, 21, 22 – 33, 34, 35, 37 and 38; 53 nodal points in Segments 19 and 20 (long cylindrical segments of the propellant tank); and 99 nodal points in Segments 3 and 36 (longest segments of the laminated composite aft and forward conical skirts). NOTE: In all the STAGS models, each part with tapered thickness in the GENOPT/BIGBOSOR4 model, such as external doublers and the four end segments of each conical skirt, are replaced by the corresponding part with constant thickness equal to half the maximum thickness of the tapered part.
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