Hi Italian
"The turbojet components of the engine thus provide far less thrust, and the Blackbird flies with 80% of its thrust generated by the air that bypassed the majority of the turbomachinery undergoing combustion in the afterburner portion and generating thrust as it expands out through the nozzle and from the compression of the air acting on the rear surfaces of the spikes."
To be precise, the J58 is at no time a "ramjet". The 80% thrust referenced above is not combusted air, but intake air, isolated from the turbo machinery and the after burner. It has more in common with "high bypass" turbofans in this mode than with a pure ramjet, a device that has no internal compressor section, only ignition. It is in this regard that the division of pressure at the intake cone resembles the propellor, though the zones are defined more by geography within the ducting than the metal stators, due the intense differentials.
IMO. What say you?