in3) and required an enlarged, bulbous cowling that fully enclosed the guns. The Mk II also featured an additional fuel tank, a variable incidence tailplane, strengthened airframe and longer exhaust pipes. The Air Service anticipated delivery of over 2,000 Mk II aircraft by the summer of 1919 but only a few were delivered before the Armistice. Persistent difficulties with the geared 200 hp Hispano-Suiza 8B prompted development of the Dolphin Mk III, which used a de-geared version of the 200 hp engine. The Mk III first flew in October 1918 and went into production just as hostilities ended. Many existing Dolphins were also converted to Mk III standard at aircraft repair depots by removing the reduction gear from the engine and fitting a revised cowling to accommodate the lower thrust line. In service, the Mk III offered slightly lower performance, but improved reliability. Survivors No complete Dolphin is known to have survived to the present, but a composite Dolphin Mk I was rebuilt at the Michael Beetham Conservation Centre, part of the Royal Air Force Museum Cosford. The airframe is based on an original length of rear fuselage from serial no. C3988. It includes many other original parts, including a fuel tank, wheels, radiators, tailplane, and elevators from serial nos. D5329 and C4033. In March 2012, the Dolphin was placed on display at the Royal Air Force Museum London in the Grahame White Hangar. Reproduction In 1977, Cole Palen built an accurate Dolphin reproduction for his Old Rhinebeck Aerodrome living aviation museum, in the mid-Hudson Valley of eastern New York. It flew regularly at Old Rhinebeck's weekend air shows until September 1990, when it crash-landed after a fuel pump failure. The aircraft is presently under restoration to flying condition. Variants Dolphin Mk I Main production version. Powered by a geared 200 hp (149 kW) Hispano-Suiza 8B. Dolphin Mk II Manufactured under license in France. Powered by a direct-drive 300 hp (224 kW) Hispano-Suiza 8F. Dolphin Mk III Powered by a 200 hp (149 kW) Hispano-Suiza 8B, modified to remove the reduction gear. Operators : Canadian Air Force No. 1 (Fighter) Squadron : Polish Air Force (postwar, donated by United Kingdom, operated 1920–1923) 19. Eskadra Myśliwska Ukrainian People's Republic Ukrainian Air Force (postwar, two aircraft loaned by Poland in October 1920, returned to Poland in February 1921) 1. Zaporoska Eskadra Ukraińska : Royal Flying Corps/Royal Air Force No. 19 Squadron No.