punk666
That is what we said above, and it applies to all types, not just high-bypass..
172driver
I suspect the advantages are higher for turbojets though.
Again, yes, what was said above*, there is an increasing divergence between pure-jet and by-pass jet net thrust as speeds approach the transonic regime. Clever inlet & first stage design has however, allowed an increasing by-pass ratio to be used at transonic and supersonic speeds with lower penalties.
* Momentum drag is very large effect, pressure recovery less
Yes, blow-in doors for low speed mass flow increase. Also spill-doors for excess mass-flow (surge conditions) can/have been incorporated, sometimes the two combined possibly