The first new design that required Kurt Tank´s attention was a former Albatros reconnaissance Aircraft project which now became the S39 later the Fw 39. The S 39 prototype was built shortly after Tank's arrival and the company's reorganisation. It was a highwing monoplane powered by an aircooled 510 hp Siemens Jupiter VI Engine wrapped in the stream-lined cowling invented by the National Advisory Committee for Aeronautics (NACA) in the US just four years earlier in 1927. It received the civilian registration D-1708 in 1932 but failed to perform satisfactorily despite Tank's best efforts to amend the original design. It was damaged during testing and scrapped.

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