Pratt & Whitney J58
The Pratt & Whitney J58 (company designation JT11D) was a jet engine used on the Lockheed A-12, and subsequently on the YF-12 and SR-71 Blackbird aircraft. The J58 was a variable cycle engine which functioned as both a turbojet and a fan-assisted ramjet. The J58 was a single-spool turbojet engine with an afterburner. Bypass jet engines were rare at the time, but Ben Rich later described the engine as "bypass jet engine by air withdrawal".
Read more about Pratt & Whitney J58: Design and Development, Applications
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—Edwin John Pratt (1882–1964)