It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
Fuel control was a problem as was the propensity of the ‑37 version of the engine to dump engine oil into the cockpit via the ventilation system. In order to re‑start, the aircraft had to descend to 35,000 feet or lower which would make it vulnerable to Soviet interception. That was unsatisfactory! Pratt & Whitney began working on a ‑31 high altitude version of the J‑57 that also provided added payload and altitude capability.
Powerplant Data: Pratt & Whitney(P & W) J57-P-37/ J57-P-37A with 10,500lb of thrust
updated to: P & W J57-P-31/ J57-P-31A with 11,200lb of thrust