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Pratt & Whitney J58

The Engine Specifications
Originally designed by Pratt & Whitney to power a projected Navy aircraft, the J58 eventually powered the SR-71 Blackbird.  This engine was a turbo-ramjet, with the turbine being largely bypassed at high speed.

The J58 is also known as the JT11B.  The earliest flight I can find is on a A-12 in 1962.

Compressor: 9-stage axial (single spool)
Turbine: 2-stage axial
Models Used by
J58: 32,500 lb (145 kN) thrust
Lockheed SR-71 Blackbird
Related Pages Related Websites
More about Pratt & Whitney
The Heart of the SR-71: The Mighty J-58 Engine

page updated 08 July 2003



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Kenneth W Shanaberger 2000 - 2010