The Rolls-Royce RB199 is a turbofan engine designed for military aircraft, primarily powering the Panavia Tornado. It features a three-shaft design, which enhances efficiency and performance at various speeds and altitudes. The engine is known for its reliability and has been a key component in several air forces since its introduction in the late 1970s. With a thrust range of approximately 20,000 to 30,000 pounds, the RB199 is capable of supporting both low-speed and high-speed flight profiles. Its advanced technology includes a variable area nozzle, which optimizes thrust during different flight conditions, making it a versatile choice for combat and reconnaissance missions.