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Concept
No.1-class auxiliary patrol boat
Résumé
The No.1 class auxiliary patrol boat was a class of patrol boat (picket boat) of the Imperial Japanese Navy (IJN), serving during World War II. 280 vessels were planned under the Maru Sen Programme (Ship # 2121–2400), however, only 27 vessels were completed before the end of the war.
During the war, Japan commandeered a large number of fishing boats for picket boat duty, with the primary duty of observing the sea to the east of the mainland. Their primary duty was to provide early warning of any U.S. Task Force attempting to close the Japan mainland. Some of the picket trawlers accomplished their duties, but this was typically by means of failing to respond to hails after encountering the enemy. the IJN decided to build a specialized picket boat to replace the large number of vessels lost in the course of duty.
The IJN intended to build 280 picket boats, however, the IJN was not able to procure sufficient wood to build the full number. The IJN built only 27 vessels before the end of the war. Those that survived war played an active part in the post-war minesweeping effort (primarily of magnetic mines) in company with the No.1-class auxiliary submarine chasers.
Auxiliary Patrol Boat No.1, completed on 28 March 1945, survived war.
Auxiliary Patrol Boat No.2, completed on 20 May 1945, survived war.
Auxiliary Patrol Boat No.3, completed on 5 August 1945, survived war.
Auxiliary Patrol Boat No.4, incomplete, rebuilt to fishing boat in postwar.
Ship No.2125 to No.2144, cancelled in 1945.
Auxiliary Patrol Boat No.25, completed on 27 April 1945, survived war, sunk by rough weather on 18 September 1945.
Auxiliary Patrol Boat No.26, completed on 2 August 1945, survived war, rebuilt to fishing boat in postwar.
Auxiliary Patrol Boat No.27, incomplete, scrapped in postwar.
Ship No.2148 to No.2150, cancelled in 1945.
Auxiliary Patrol Boat No.31, completed on 29 July 1945, survived war, transferred to Japan Maritime Safety Agency and renamed MS 18 on 1 May 1948.
Auxiliary Patrol Boat No.32, incomplete, rebuilt to fishing boat in postwar.
Source officielle
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