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July 29th 05, 03:26 AM
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"Jorge R. Frank" wrote in message ... " George" wrote in news:TOfGe.218743 $nG6.143310@attbi_s22: "Richard Kaszeta" wrote in message ... (Roy Smith) writes: I assume NASA didn't just flip a coin to decide which goes on top, so there must be more to it that that. What's the real answer? I think it's due to center-of-mass considerations. The loaded LOX tank is heavier than the loaded LH2 tank, and you need to be able to be sure that the center of mass of the combined Shuttle/ET is located far enough forward that the thrust line from the SSMEs can pass through it. But isn't the LH2 tank twice as big as the LOX tank? Yes. And LOX is eight times as dense as LH2. Your point is? -- JRF Just pointing out a fact is all. 
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