The J58 Engine

Early J-58 Engine Development

By the end of 1962, only two A-12s were engaged in flight tests. Full test speeds could not be reached since the J-58 engines were not fully available and were experiencing problems. 

J58 The Powerplant for the Blackbirds

J58 The Powerplant for the Blackbirds
The Pratt & Whitney J58 (company designation JT11D-20) was a jet engine that powered the Lockheed A-12, and subsequently the YF-12 and the SR-71 aircraft. The J58 was a single-spool turbojet with an afterburner. It had a unique bleed from the compressor to the afterburner which gave increased thrust at high speeds.
 
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