User:BilCat/Sandbox/Pratt & Whitney J91

The Pratt & Whitney J91 (company designation JT9) is a turbojet engine developed by Pratt & Whitney for the North American XB-70 Valkyrie Mach 3 bomber program. Although the General Electric YJ93 was selected for the XB-70, the J91 provided the basis for the later Pratt & Whitney J58 which would power the famous Lockheed SR-71 Blackbird.

Design and development
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Variants
Data from: The Engines of Pratt & Whitney: A Technical History


 * J91-P-1: 24,500 lbf ( kN), 35,000 lbf ( kN) thrust with afterburning
 * J91-P-5: 28,700 lbf ( kN), 41,500 lbf ( kN) thrust with afterburning