Fieseler Fi 157 and Fi 158
During the mid thirties, Fieseler received a contract from the Technische Amt of the Reichsluftfahrtministerium for the design and construction of a pilotless drone possessing a relatively high performance and suitable for use as a target for anti-aircraft artillery. The drone was to be carried aloft beneath a bomber, released and subsequently controlled by radio. Fieseler's proposals were accepted and three prototypes were ordered under the designation Fi 157. Simultaneously, Fieseler proposed a piloted version, the Fi 158, which could be used for experiments in remote radio control. Three prototypes of the Fi 157 were tested but all crashed. Nevertheless, the company persisted with development of the piloted Fi 158, and this appeared in 1938, differing from the pilotless drone primarily in having a single-seat cockpit enclosed by a hinged canopy, and a fully-retractable undercarriage.
The Fi 158 V1 was entirely of wooden construction and was powered by a 160 hp Hirth HM 506A six-cylinder air-cooled engine driving a two-blade variable-pitch metal airscrew.
Source: Flying Review International July 1969