The Rolls-Royce Derwent is a British turbojet engine developed in the late 1940s. It was one of the first engines to be used in military aircraft, notably powering the de Havilland Vampire and the Gloster Meteor. The Derwent was known for its reliability and performance, contributing to the advancement of jet propulsion technology. This engine features a single-spool design and was capable of producing around 3,500 pounds of thrust. Its development marked a significant step in the evolution of jet engines, paving the way for more powerful and efficient designs in the following decades.