 The wings were braced by interplane I-struts of broad aerofoil cross-section.Two prototypes were built, the first powered by a 340 kW (450 hp) water-cooled 12-cylinder "broad-arrow" Napier Lion engine; the second had its first flight in 1926 and had a 421 kW (565 hp) version of the Lion.The second prototype underwent evaluation by the "Reichswehr" to equip the clandestine training school at Lipetsk, but the Heinkel HD 17 was selected instead and no further aircraft were produced.