In the 1930s, as part of its interest in the Pacific region, Japan saw the need for floatplanes to operate from sheltered waters of the south Pacific islands in its future campaigns.
Single-engine fighter and fighter-bomber seaplaneDue to the lack of available airstrips on some of the islands Japanese forces were taking during World War II it was decided to develop a floatplane fighter version of the Mitsubishi A6M Zero-Sen fighter, and, as Mitsubishi was fully involved in producing the land-based variant,
Friedrichshafen Flugzeugbau GmbH was founded in 1912 in the town of that name on Lake Bodensee, this area being famous for its construction of the Zeppelin airships.
In 1937 the Japanese Navy sought the design of a three-seat reconnaissance floatplane, and a specification was issued to a number of aircraft manufacturing companies.
The S-5 was one of a series of racing aircraft designed by R J Mitchell (designer of the Spitfire) in the 1920s, this aircraft being designed and built for the 1927 Schneider Trophy Race to replace the S-4 which crashed during trials.
As noted in the Genairco article, General Aircraft was taken over by Tugan Aircraft. A special seaplane variant was built for Rabaul Airways and became VH-URH (c/n 1 or TA-1).