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Ariane Economies of Scale
"Paul F. Dietz" wrote in message ...
Ian Woollard wrote: Let's say you hypothetically manage to build an SSTO with a 5% dry mass (dry mass here does not including payload mass). It just creaks into orbit, but margins are terrible; it's rather unreliable. You can then build a technologically equivalent TSTO having very nearly 5% dry mass for each stage (not including payload mass). It probably doesn't quite end up exactly the same dry mass, there's minor differences due to scaling laws and the two sets of engines you have in TSTO, but it will be pretty darn close. But the margins would be the same. They have not INHERENTLY gone up. That's all I'm saying. But this is because you've optimized the TSTO design incorrectly. 'Incorrectly'? Incorrectly for what? Perhaps I just want a slightly bigger payload. If I'm optimising for payload per GLOW (this is frequently done for TSTO vehicles, for some bizarre reason), then I've optimised it correctly. Paul |
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