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The 100/10/1 Rule.
Henry Spencer wrote: You might like it there, but other considerations can intervene, like the extra structural weight incurred by putting most of the propellant mass up high. The LOX was on the bottom in the S-II, the S-IV/S-IVB, and the Ariane 1/2/3/4 third stage, and still is in the Centaur, the Delta IV upper stage, and the GSLV third stage. It might have ended up on the bottom in the ET, too, had it not been for the asymmetric vehicle configuration -- keeping the ET's changing center of mass within the limited gimbal range of the SSMEs absolutely dictated putting the LOX tank as far away from the SSMEs as humanly possible. I thought the gimbaling would probably be the main problem... the thing is already fairly unstable without getting it completely unstable by sticking the LH2 on top and having it constantly trying to go out of control. Was there any particular reason the LOX ended up on top in the Atlas? Gimbaling limits again? I note that both Jupiter and Thor had it on the bottom. Pat |
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