similar to the Heinkel He 111, tested during 1938 with generally favourable results. Six additional aircraft based on the V7 pattern were then ordered, designated He 116B-0, although they also received prototype numbers V9 to V14. The B-0 s were intended to operate at extremely long range, outside the range of enemy fighters, and therefore had no defensive armament fitted. All eight (V7 through V14) were issued to reconnaissance units prior to the war, but by that time the idea of a slow-moving unarmed plane providing any useful information seemed unlikely. Instead they were used over German territory providing mapping services. He 116RV3 was removed from the line to be converted into a record-breaking prototype. The modifications included a larger wing with a span, and increased fuel tankage in the fuselage. The Hirth HM 508H engines provided a better fuel economy through operation at lower rpm. For take-offs with maximum fuel the He 116R, Rostock, was fitted with four RATO units. On its first record flight attempt one of the rockets tore loose and hit the wing, requiring extensive repairs. After repairs were completed a second attempt was made on 30 June 1938, successfully covering unrefueled, at an average speed of . Operators Luftwaffe Lufthansa Manchuria Aviation Company Specifications (He 116A) See also References Bibliography 1930s German mailplanes He 116 Four-engined tractor aircraft Four-engined piston aircraft Aircraft first flown in 1936