The Goblin was one of the first turbojet engines to be used in experimental aircraft during World War II and then in the first mass-produced jet aircraft. The original prototype, called H-1, was developed in the early 1940s by engineer Frank Halford, who later designed a larger model called Ghost. The engine has a single-stage centrifugal compressor and various direct-flow combustion chambers. Initially the Goblin was mass-produced by the de Havilland Engine Company and later by Rolls-Royce Limited. In Italy it was used on the de Havilland DH.100 Vampire, the first turbojet fighter of the Italian Air Force, and FIAT chose it for the G.80 trainer, its first jet aircraft of own design.