Built to the same concept as the private venture Sopwith B1 the Sunbeam was in response to an Admiralty specification for a single engine, single seat bomber. With the fuel tanks in the fuselage above the c of g the pilot sat to the rear of the fuselage. With bomb racks under the wings and a synchronised Vickers .303" machine gun above the engine, some 13 feet from the pilot, which meant he had no way of clearing it should it jam the Sunbeam was overweight and under powered. It's performance was not as good as the Sopwith and neither of them held a candle to the DH 4 and the later DH 9. Only one flew another one in development was scrapped. Engine: Sunbeam Arab V8 water cooled developing 200 h.p.