On Sun, 2 Feb 2003, Hans Ulrich Ammann wrote:
> One of the propellant combinations they studied in more detail was
> GOX/Ethanol LOX/Ethanol. Besides igniters and small test engines
> there was the intention to build a LOX/HC truster to fit in the
> envelope of the Shuttle RCS engine...
NASA has been *interested* in replacing the OMS/RCS systems with ones
using non-toxic propellants for a long time. Unfortunately, it has never
quite made it to the top of the to-do list, and they've never had enough
funding for shuttle upgrades to do anything but the very top of the list
(which tend to be things like the cockpit upgrades, driven by the need to
replace gear for which spares are now unobtainable).
Henry Spencer
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