the ability to use engines with mutipule propellents, say flushing the engine with a blast of noble gas after using one propellent and then using the new one for like High thrust fuel (CO2) or high exhaust velocity fuel
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Another interesting idea but the main issue comes down to reactor size and nozzle size. If you wanted to significantly change between say a high exhaust fluid like Hydrogen Deuteride and Methane, huge chunks of the engine bell and reactor pump would need to be edited and geometrically changed to affect the fluid dynamics and thermal dynamics of the new propellant. Everything from expansion rate to heat retention would need to be considered, i think it might be easier to simply be able to mount two different rocket engines to the base of our ships.
The Honor Harrington R&D departments took 200 years of space combat tradition, 5 years of interstellar total wars and 6 books (approximately) to come up with multistage missiles as a secret superweapon. I can see our RFP friends going down the same path...
Something wrong with the UI? Let me know, I'll add it to the UI Thread