Barit-1
A variable-cycle turbo-ramjet, did you say, with possible TSTO capability? Then you're just the person to answer my next trivial question.
Given that aside from propelling the aircraft, another significant function of the powerplant is driving all those other devices (eg. generators, via CSDs, and hydraulic pumps), crucial for auxiliary capabilities, not to mention "small neccesities" such as fuel pumps, all of which derive their motive power from a tower shaft PTO of the turbocompressor drive shaft, just what do all you "RTA"-types have in mind for a substitute when the main powerplant has transitioned completly to ramjet/scramjet mode, or is it an unspoken consideration that the core will even then still be allowed to "windmill" in a small portion of the airflow as the qunitessential "RAT"?