Uploaded November 2025 | Updated September 2026, 2 weeks ago
The J58 is an American afterburning turbojet engine that powered the Lockheed SR-71 and its predecessors, the A-12 and YF-12 aircraft. Its unique design allows it to function as a "turbo-ramjet" at high speeds, incorporating a bypass system with six ducts to redirect airflow from the fourth stage of the compressor to the afterburner. This feature enables continuous high-performance operation at speeds over Mach 3 by boosting thrust and cooling the engine.
The J58 is an American afterburning turbojet engine that powered the Lockheed SR-71 and its predecessors, the A-12 and YF-12 aircraft. Its unique design allows it to function as a "turbo-ramjet" at high speeds, incorporating a bypass system with six ducts to redirect airflow from the fourth stage of the compressor to the afterburner. This feature enables continuous high-performance operation at speeds over Mach 3 by boosting thrust and cooling the engine.
