No.251-class auxiliary submarine chaser
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{{Infobox ship image |Ship image= Japanese submarine chaser 251.jpg |Ship caption= Auxiliary Submarine Chaser No.251 in 1938 }} {{Infobox ship class overview |Name=*No.251-class aux. submarine chasers
|Builders=*Nihon Kōkan Corporation |Operators=20px Imperial Japanese Navy |Class before= |Class after= |Subclasses= |Cost= |Built range=1936 – 1939 |In service range= |In commission range=1937 – 1945 |Total ships building= |Total ships planned=3 |Total ships completed=3 |Total ships cancelled= |Total ships active= |Total ships laid up= |Total ships lost= |Total ships retired=3 |Total ships preserved= }} {{Infobox ship image |Ship image=IJN No53 Submarine Chaser 1937.jpg |Ship image size=300px |Ship caption=Auxiliary Submarine Chaser No.253 in 1937 }} {{Infobox ship characteristics |Hide header= |Header caption= |Ship class= |Ship type=Submarine chaser |Ship tonnage= |Ship displacement= {{convert|170|LT|t|0|abbr=on}} standard |Ship length= {{convert|45.0|m|ftin|abbr=on}} overall |Ship beam= {{convert|4.80|m|ftin|abbr=on}} |Ship height= |Ship draught=*No.251 and No.252
|Ship draft= |Ship propulsion=*No.251
|Ship power= |Ship speed= {{convert|23.0|kn|mph km/h|lk=in}} |Ship range= {{convert|800|nmi|km|lk=in|abbr=on}} at {{convert|14|kn|mph km/h|abbr=on}} |Ship boats= |Ship troops= |Ship complement= 41 |Ship capacity= |Ship crew= |Ship EW= |Ship armament=*1 × 40 mm heavy machine gun
|Ship armour= }} |
The {{nihongo|No.251 class auxiliary submarine chaser|第二百五十一号型駆潜特務艇,|Dai 251 Gō-gata Kusen-Tokumutei}}At first {{nihongo|No.51 class submarine chaser|第五十一号型駆潜艇,|Dai 51 Gō-gata Kusentei}}, until 15 November 1940. was a class of submarine chasers of the Imperial Japanese Navy (IJN), serving during World War II. 3 vessels were built in 1936 – 1939 under the Maru 2 Programme. They have two subclasses, this article handles them collectively.
Background
- In 1934, the IJN planned an experimental model of a high-speed coast defense submarine chaser. The IJN wanted over {{convert|20|kn|mph km/h|abbr=on}}, however the Navy Technical Department (Kampon) had not designed this type of small craft and the needed high-powered diesel engines yet.
- The IJN ordered the hull design from Thornycroft, and the high-powered diesel design from MAN, to study a small-sized high-speed boat.
Design
- The Thornycroft drawings were not able to satisfy the IJN, because the design's center of gravity was too high, and had bad drainage. Kampon made a hull design based on the Hayabusa class torpedo boat instead.
- The IJN was satisfied with MAN diesel specifications, however their designs were very complicated and very expensive. The IJN bought two engines and labeled them {{nihongo|MAN Mk.1 diesel|マ式1号ディーゼル, |Ma-Shiki 1 Gō diesel}}. Further, the IJN ordered copies of these engines from Kawasaki Heavy Industries and Mitsubishi Heavy Industries.
- Also, 1 vessel was equipped with a Kampon turbine, because the MAN diesel engines were unsuitable for a mass production.
Service
- The IJN deployed them to a mine warfare school after having finished their examination, because they were too small.
- They became a training ship of the mine warfare school, and they acted in Tokyo Bay.
Ships in classes
=<small>''No.251''-class</small>=
- Project number K5A. 2 vessels were completed. They were equipped with MAN design diesels. The No.252 was equipped the copied MAN diesels by Kawasaki and Mitsubishi.
==<small>''No.251''</small>==
- 14 December 1936: Laid down as the {{nihongo|Submarine Chaser No.51|第51号駆潜艇, |Dai 51 Gō Kusentei}} at Nihon Kōkan, Tsurumi Shipyard.
- 9 June 1937: Launched.
- 30 September 1937: Completed.
- 15 November 1940: Classified to the Auxiliary submarine chaser, and renamed {{nihongo|Auxiliary Submarine Chaser No.51|第51号駆潜特務艇, |Dai 51 Gō Kusen-Tokumutei}}.
- (after): Assigned to the mine warfare school (Kurihama).
- 30 April 1943: Renamed {{nihongo|Auxiliary Submarine Chaser No.251|第251号駆潜特務艇, |Dai 251 Gō Kusen-Tokumutei}}.
- 28 August 1944: Classified to the Support vessel (tugboat), and renamed {{nihongo|No.1658|公称第1658号, |Kōshō-Dai 1658 Gō}}.
- August 1945: The end of war at Uraga, later nothing more was heard.
==<small>''No.252''</small>==
- 14 December 1936: Laid down as the {{nihongo|Submarine Chaser No.52|第52号駆潜艇, |Dai 52 Gō Kusentei}} at Nihon Kōkan, Tsurumi Shipyard.
- 25 August 1937: Launched.
- 25 July 1939: Completed.
- 15 November 1940: Classified to the Auxiliary submarine chaser, and renamed {{nihongo|Auxiliary Submarine Chaser No.52|第52号駆潜特務艇, |Dai 52 Gō Kusen-Tokumutei}}.
- (after): Assigned to the mine warfare school (Kurihama).
- 30 April 1943: Renamed {{nihongo|Auxiliary Submarine Chaser No.252|第252号駆潜特務艇, |Dai 252 Gō Kusen-Tokumutei}}.
- 15 February 1944: Classified to the Support vessel (tugboat), and renamed {{nihongo|No.1650|公称第1650号, |Kōshō-Dai 1650 Gō}}.
- August 1945: The end of war at Uraga, later nothing more was heard.
=<small>''No.253''-class</small>=
- Project number K5B. 1 vessels was completed. She was equipped with Kampon turbine. She was classed in the No.251-class in the IJN official documents.
==<small>''No.253''</small>==
- 9 January 1937: Laid down as the {{nihongo|Submarine Chaser No.53|第53号駆潜艇, |Dai 53 Gō Kusentei}} at Ōsaka Iron Works, Sakurajima Factory.
- 15 July 1937: Launched.
- 31 October 1937: Completed.
- 15 November 1940: Classified to the Auxiliary submarine chaser, and renamed {{nihongo|Auxiliary Submarine Chaser No.53|第53号駆潜特務艇, |Dai 53 Gō Kusen-Tokumutei}}.
- (after): Assigned to the mine warfare school (Kurihama).
- 30 April 1943: Renamed {{nihongo|Auxiliary Submarine Chaser No.253|第253号駆潜特務艇, |Dai 253 Gō Kusen-Tokumutei}}.
- 15 February 1944: Classified to the Support vessel (tugboat), and renamed {{nihongo|No.1651|公称第1651号, |Kōshō-Dai 1651 Gō}}.
- August 1945: The end of war at Uraga.
- August 1946: Sink by unknown effect.
Footnotes
Bibliography
- Ships of the World special issue Vol.45, Escort Vessels of the Imperial Japanese Navy, {{cite web |url=http://www.ships-net.co.jp/ |title=Kaijinsha}}, (Japan), February 1996
- The Maru Special, Japanese Naval Vessels No.49, Japanese submarine chasers and patrol boats, {{cite web |url=http://www.kojinsha.co.jp/ |title=Ushio Shobō}} (Japan), March 1981
{{WWII Japanese auxiliary ships}}
{{Use dmy dates|date=June 2017}}
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