F-1 Class Minelayer:
In February 1922, after the WNT ratification Koko no Kaigun was effectively an indipendent navy since five months as a result of the Bilateral Agreements of September 1921. But this it also meant it had lost most of it's auxiliary and smaller units, whose tasks had been performed by the IJN before that date. One of this tasks was minelaying.
Istantly recongnizing URSS and the United States as possible long-term foes the naval staff issued the requirement for a small fleet of minelayers to be made operational in the shortest possible time. Roughly at the same time the last eight of the nine Kuchikukan Destroyers had been decommissioned to cut the surplus generated by the Shi-Shi Kantai cancellation. Instead of scrapping them, the Naval staff immediately recongized the advisability of an extremely fast and temporary conversion. The eight ships were thus promptly saved from the scrapyards and sent to Kumoi Arsenal for conversion into minelayers. The aft 76mm gun and both torpedo tube sets were removed, with rails for 40 mines, all to be stored on deck, fitted in their place. The short range the ships possessed was not deemed an issue since it was counterbalanced by the high 30-knot speed the former-Destroyers possessed. Renamed Fusetsukan (minelayer) 1 through 8 the units were in service by 1923.
Despite beign small, and carrying a small complement of mines, the ships served well in their temporary tasks. F-1 was decommissioned for good in December 1925 when the first Fusetsukan-9 Class unit (another converted former Destroyer) entered service, another three units left the fleet by 1928. F-6 was wrecked and lost off Miyamori on may 8th 1929. F-5 and F-7 left service in the early 30's. F-8, the last unit, soilered until 1936, operating mainly for trining and coastal duties, before finally beign decommissioned and scrapped.
Ships in class:
F-1 (ex DD-2) Converted 1922-1923 - Decommissioned 1925
F-2 (ex DD-3) Converted 1922-1923 - Decommissioned 1926
F-3 (ex DD-4) Converted 1922-1923 - Decommissioned 1928
F-4 (ex DD-5) Converted 1922-1923 - Decommissioned 1928
F-5 (ex DD-6) Converted 1922-1923 - Decommissioned 1931
F-6 (ex DD-7) Converted 1922-1923 - Wrecked 1929
F-7 (ex DD-8) Converted 1922-1923 - Decommissioned 1932
F-8 (ex DD-9) Converted 1922-1923 - Decommissioned 1936