I'm reminded of the quote from Jeff Greason about liquid catalyst work they did for Roton's HTP monoprop engine:
"All the complexity of bi-prop and none of the benefits."
Think of an HTP/Kero liquid catalyst engine as a tri-propellant - because that's actually what it is.
Michael
I'm not a big fan of liquid catalysts in general, but it isn't quite as bad as a full biprop.
With a 100:1 mixture ratio, a catalyst tank can be stuck just about anywhere, it isn't a big structural piece requiring an intertank section. Similarly, you can ignore throttling on the catalyst and just let it run at full flow, because doubling the amount is still trivial.
We are considering mixed-monoprop + liquid catalyst for building huge engines (20,000 lb thrust) where solid catalyst would cost fifteen thousand dollars or so.
John Carmack
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