The J57 Turbojet Engine is a turbojet engine developed by Pratt & Whitney in the 1950s. It was widely used in military aircraft, including the Boeing B-17 and Lockheed F-104 Starfighter. The engine features a single-spool design and is known for its reliability and performance at high speeds. This engine operates by drawing in air, compressing it, mixing it with fuel, and igniting the mixture to produce thrust. The J57 was one of the first engines to incorporate an afterburner, which enhances thrust by injecting additional fuel into the exhaust stream, making it suitable for supersonic flight.