The PBS TJ80 is a small turbojet engine which has been designed for missiles, target drones and Unmanned Aerial Vehicles (UAV’s). The engine is controlled by an electronic system, which uses a starter generator and DC-DC converter for starting purposes as well as operating both the fuel and oil pumps. The engine comprises a single-stage radial compressor, radial and axial diffuser, annular combustion chamber, and single-stage axial turbine. The rotor bearings are lubricated by an independent oil system, while the ignition system is a low voltage system.