Turbo ram jet 3D model

This is an engine for SR 71 blackbird.Pratt & Whitney J58 axial-flow turbojet engines.The J58 was a considerable innovation of the era, capable of producing a static thrust of 32,500 lbf (145 kN).The engine was most efficient around Mach 3.2,[58] the Blackbird's typical cruising speed. At take-off, the afterburner provided 26% of the thrust. This proportion increased progressively with speed until the afterburner provided all the thrust at about Mach 3.[56]

Air was initially compressed (and heated) by the inlet spike and subsequent converging duct between the center body and inlet cowl. The shock waves generated slowed the air to subsonic speeds relative to the engine. The air then entered the engine compressor.