The Bristol Proteus is a British turbojet engine developed in the 1940s by the Bristol Engine Company. It was designed for use in various aircraft, including the Avro Vulcan and the Handley Page Victor. The engine is known for its high thrust and reliability, making it suitable for military applications. The Proteus features a unique design with a single-stage centrifugal compressor and a single-stage turbine. It was one of the first engines to utilize a bypass system, allowing for improved fuel efficiency. The engine played a significant role in the development of jet propulsion technology during its time.