Hybrid engines offer some practical advantages and some budgetary ones that can offset lower ISP, including potentially safer solid fuel to store and non cryogenic storage of some oxidizers like hydrogen peroxide.

Question: If one chose concentrated (and potentially chemically stabilized) hydrogen peroxide as a comparatively convenient liquid oxidizer to store, and considered both wax-like and rubber-like solid fuels, what would be the main advantages and disadvantages of each for a modest few-cubesats-to-LEO-capable launch vehicle's first stage engine?

Besides differences in Isp which can in both cases be addressed with additives, what are other factors and tradeoffs that should be considered when choosing between the two? Just for example do things like ease of throttling and/or starting differ? Is cokikng more of a problem for one than the other? Doe the differences in mechanical and thermal properties lead to specific design challenges?



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