External Tank WT. lbs. X of Dry Wt. Forward tank 12,352 17.9 Inter tank 12,080 17.5 Aft tank, LH2 28,900 41.9 Separation Hardware 4,743 6.86 Propulalon linoa> 3,76(1 5.4X Wt. setals Hiscellaneoua 1,000 1.45 less raise. 61,835 62,835 91.06 Insulation 8.94 1 69,025 100.00 X of total wt. 1 of Material Alloy 2219 64.44 44,480 2024 19.34 13.349 7050 3.3 2,278 7075 0.87 601 21-6-9 0.93 642 Inconel 718 0.44 304 T1 6-4 0.31 214 89.63 Polyurethanes 5.54 3,824 Silicone ReaIn 6 Ablatives 2.37 1,636 Foaaa & Adhesives 1.03 711 Miscellaneous 1.45 1,001 10.39 69 69,025 Al I av 56.490# Cu 3,450 C m 2.760 0 1,725 Si ■a 690 Fe ■B 415 13 elements Mg 268 from 200 to Zn «• 173 35.0001 N1 200 C, H . 0 , M Ti • 220 9 metallic or Cr •B 188 metalloid H era 466 N ■a 246 Others era 1,807 (Co, Mo. V, etc) 69,022
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