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<p>the LOX tank and bottom of the LH2 tank. It consisted of two <a href="page.php?w=aluminum">aluminum</a> sheets separated by a honeycomb structure made of <a href="page.php?w=phenolic_resin">phenolic resin</a>. It insulated a 126 F-change temperature differential between the two tanks. The use of a common bulkhead saved 3.6 tonnes in weight, both by eliminating one bulkhead and by reducing the overall length of the stage. The S-II's common bulkhead design was tested in 1965 on the subscale Common Bulkhead Test Tank (CBTT), made of only 2 LH2 tank</p><p>
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