[Spaceships] Perpetual Motion?

[acrosome]

So- errata.

Any commentary on the other questions:

Originally Posted by acrosome

Also, since the chemical refinery makes rocket fuel, is there a rule to divide production by 9 if you're only keeping the hydrogen? This seems reasonable- an oxygen molecule is mass 32, and two hydrogen molecules are mass 4, so the mass fraction is 4/36 = 1/9.

Another question: For rockets that have the option of using water as reaction mass- can one switch between water and hydrogen at will, or must the rockets and tankage be fuel-specific? Clearly in the Real World it is the latter, but I don't see how making a multifuel rocket would be beyond the capabilities of a society that can make a ram-rocket. Perhaps double cost (since a ram-rocket is 5x cost)? There are also rules for other reactions masses, like ammonia; same question.

Related question: Clearly, one uses the Chemical refinery to crack water into LOX/H2 or to make hydrogen. I assume that one can specify a version that isolates ammonia or methane as well. But what about water? It only costs $20/ton, but I assume that's at the starport and is mostly infrastructure and handing costs. So if you have to do a true frontier refuel someplace that liquid water is available can I assume that one can just filter it and pump it into the tanks, and that any ship capable of using water will have such a filter/pump? If so, what is a fair pumping rate? One fuel tank per hour? Is it different if the water is ice?

Final question: Are there stats for what one power point is, somewhere?