Solid rockets for the moon

>>>Then there's the hybrid rocket idea: solid fuel but liquid oxidizer. Turns
out that approach combines the best of both worlds in a lot of ways. It's
safer, and throttleable. I can't help but think about lunar setups when I
think about them. There was a company looking into hybrids called Amroc,
but they went bankrupt. The good news is that Jim Benson of SpaceDev
acquired all their test data, and seems to be moving that research forward.>>>

I can remember someone on the Artemis list proposing something like this.
Their idea was to use an aluminium honey comb, with oxygen gas flowing through
it. In this situation, refueling wouldn't be too hard. If memory serves, LOX is
a soft cryogen. The Aluminium honeycomb could be loaded into the engine in
disposable tubes. This would prevent the inside of the rocket from becoming
clogged up with aluminium oxide. If ignition is a problem, then a charge
containing white phosphorus (which flames on contact with oxygen) could be
triggered. A large electric arc might also do the job.

Tony

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