On Fri, 27 Sep 2002, John Carmack wrote:
> Kerosene works great. The residue problem is only an issue when you are
> cooling with kerosene, which a peroxide biprop isn't.
No, they're a more general problem than that. During testing, according
to the Rotary/XCOR folk, it's not uncommon to get propellant A into the
plumbing for propellant B by accident. XCOR uses isopropanol in its big
engines because of bad memories of repeatedly scrubbing kerosene residues
out of complex LOX plumbing.
Henry Spencer
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