The goal my project is to allow an existing space program to transition from using LF nukes to using Hydrogen NTRs.  The benefit is that existing craft will still function, while allowing the launch of new NTR based craft which means both may be used together. A simpler approach would be to simply duplicate each part. I decided to make the engine a dual mode engine meaning that it could be switched between fuel types like the rapier, this can be switched in flight preventing existing craft
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