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

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.

At that point 30cc of TEB was injected into the burner cans, a characteristic green flame was emitted, the J58 lit off, accelerated and started to run on its own.

Dec 17, 2013 · “To experience a J58 in full burner close up and personal is hard to describe. Picture a gigantic blow torch, 40 inches in diameter, putting out a blue-yellow-orange flame over 50 feet long....

The J58 engine utilized a unique bleed bypass system to match the core engine performance characteristics to its augmentor. This feature gave the J58 ramjet-like high Mach number thrust capability. In addition, as shown in figure 2, the J58 used an uncooled circumfrantial ring flame holder configuration in the augmentor. This type of flame holder

An afterburner has a limited life to match its intermittent use. The J58 was an exception with a continuous rating. This was achieved with thermal barrier coatings on the liner and flame holders [16] and by cooling the liner and nozzle with compressor bleed air …

Oct 18, 2022 · The J58 engines each weighed about 6,000 pounds, had a 9-stage axial flow compressor, and a lot of secret stuff that enabled the SR-71 to fly at Mach 3.3. An engineer figured they would need about 3500 RPM and at least 800 pounds of torque to start the engine.

May 2, 2019 · To experience a J58 in full burner close up and personal is hard to describe. Picture a gigantic blow torch, 40 inches in diameter, putting out a blue-yellow-orange flame over 50 feet long. Imagine standing 30 feet from this, feeling the vibration and heat.

Mar 26, 2021 · The engines would also flame out because JP7 didn't like burning at those slow speeds, and they only carried 16 shots of TEB to reignite the engines. Firing up the afterburners also took a shot of TEB. It was pretty tricky keeping …

The air-breathing Pratt & Whitney J58 turbojet engine (company designation of JT11D-20J/K) was initially designed for service with the United States Navy (USN) as a high-performance powerplant for extended high-speed/high-altitude work (in excess of Mach 3.0 and 80,000 feet).