Could be something like the SR-71 engine, relegating more air to be bypassed and burned in the ramjet-like afterburner.
Who knows. Shouldn’t speculate with so little information. My only point was 0.8 is not a prohibitive BPR.What would even be the use case for this, M2+ supercruise for something? Wouldn't modern high speed recon aircraft use TBCC instead.
Due to high altitude and material limits or more from a fuel efficiency/ low IR emission side?Exhaust temperature. They wanted this thing to be cool. They are probably entertaining turbofans for supersonic but VLO recon aircraft.
Low IR emissionDue to high altitude and material limits or more from a fuel efficiency/ low IR emission side?