Notwithstanding OP’s query, there is a wealth of discussion on the recommended thread (thanks TurbineD)
In my opinion, it answers point proffered in this thread, from lomapaseo and wiedehopf Both, and I conclude without doubt that the engine/airframe in question here, the SR-71, is a Ramjet powered aircraft. In fact, it is by definition powered by partial contributions of three distinct power plants: Turbojet, Ramjet, and “transitional”. (Hybrid).
To realize the nature of this airplane is to have to confess to awe. Nothing short of pure aeronautical genius......
concours