peter
One picture I have of the mechanism. The engine without afterburner peaks at some mach value, say 1.7. After that, the a/c cannot accelerate any further, the drag prevents it. The afterburner lights, and acceleration resumes, but the afterburner is reacting against the gas path, not the engine. The engine mounts are pinned back at the point where the turbosystem peaks, and remain so beyond that velocity. The Afterburner makes its thrust pushing on the gas flow at the start of the AB cabinet cross section.
A friend flew the F4 and recounted his experience at M2. It had to be done in a dive. He tells of pulling the engines out of AB, and it felt like he had hit a brick wall. Until he decelerated to some lesser Mach, the extreme deceleration was unnerving, indicating the drag had been there all along. He explained it in a way similar to that above, that the engine mounts were driven back into the frames, not pulling forward on them. Even in full burner at 2+.
Sounds counterintuitive.
Kelly Johnson can call the J58 anything he liked, seems to me. But the classic definition is what it is....
Last edited by Lyman; 29th Jan 2013 at 03:21.