W-13-class minesweeper
The No.13 class minesweeper was a class of minesweepers of the Imperial Japanese Navy, serving during the 1930s and World War II. 6 vessels were built in 1931-36 under the Maru 1 Keikaku. They have two sub classes, this article handles them collectively.
Background
- Improved model of the No.1-class. The IJN tried to a small hull than No.1-class to give a performance the same as No.1-class. And this attempt failed when the vessels were discovered to be top heavy by an investigation of the fleet in the aftermath of the Tomozuru Incident.
Ships in classes
''No.13'' class
- Project number I3A. 4 vessels were built in 1931-1934. No.15 and No.16 were behind with the completed by the Tomozuru Incident. They had clipper-bow.
| Ship | Builder | Laid down | Launched | Completed | Fate |
| No.13 | Fujinagata Shipyards | 22 December 1931 | 30 March 1933 | 31 August 1933 | Sunk by bombardment from Netherlands pillbox at Tarakan Island on 12 January 1942. Decommissioned on 30 November 1945. |
| No.14 | Ōsaka Iron Works | 22 December 1933 | 20 March 1933 | 30 September 1933 | Sunk by bombardment from Netherlands pillbox at Tarakan Island on 12 January 1942. Decommissioned on 30 November 1945. |
| No.15 | Fujinagata Shipyards | 6 April 1933 | 14 February 1934 | 21 August 1934 | Heavily damaged by USS Tilefish on 5 March 1945, later agrounded. Decommissioned on 10 May 1945. |
| No.16 | Mitsui, Tama Shipyard | 20 June 1933 | 30 March 1934 | 29 September 1934 | Sunk by air raid off Makassar on 11 September 1943. Decommissioned on 11 November 1943. |
''No.17'' class
- Project number I3B. 2 vessels were built in 1935-1936. Improved model of the No.13-class. About their appearance, bow was changed to double-curvature bow and fitted Kampon geared turbine.
| Ship | Builder | Laid down | Launched | Completed | Fate |
| No.17 | Ōsaka Iron Works | 28 January 1935 | 3 August 1935 | 15 January 1936 | Decommissioned on 20 November 1945. Scrapped on 1 September 1948. |
| No.18 | Mitsui, Tama Shipyard | 2 February 1935 | 19 September 1935 | 30 April 1936 | Sunk by air raid off Hainan on 26 November 1944. Decommissioned on 10 January 1945. |