were ordered. A total of 81 A-variant aircraft were produced. He 60B Initial production version, commencing in 1934. He 60B-3 In 1933 a single aircraft was fitted with a 671 kW (900 hp) Daimler-Benz DB 600 engine in an effort to improve performance. However, the development was dropped. He 60C In late summer 1934, the improved C-variant went into production, with first deliveries in Autumn 1934. He 60D The D-variant was similar to the He 60C, with the capability added for a fixed MG-17 machine gun and improved radio equipment. Production commenced in June 1936. He 60E 6 aircraft were ordered by Spain, and these D-variants were called the 60E, ending delivery in April 1937. They flew coastal patrols in the Spanish Civil War, and the last aircraft were withdrawn from service in 1948. Operators Bulgarian Navy - 5 examples from 1942-1944 Luftwaffe Kriegsmarine Spanish Air Force Specifications (He 60) See also References Notes Bibliography Donald, David (editor). Warplanes of the Luftwaffe. London:Aerospace Publishing, 1994. . Gerdessen, Frederik. "Estonian Air Power 1918 – 1945". Air Enthusiast, No. 18, April – July 1982. pp. 61–76. . Green, William. War Planes of the Second World War: Volume Six Floatplanes. London:Macdonald 1962. Smith, J.R. and Kay, Antony L. German Aircraft of the Second World War. London:Putnam, 1972. . Lang, Gerhard. The Heinkel HE 60 (Luftwaffe Profile). Schiffer Publishing, 2004. Biplanes 1930s German military reconnaissance aircraft Floatplanes He 060 Single-engined tractor aircraft Aircraft first flown in 1933