No.1 class auxiliary submarine chaser

No.1 class on 10 January 1945
Class overview
Name:	No.1-class auxiliary submarine chaser
Builders:	Hull Ichikawa Shipyard Gōriki Shipyard Koyanagi Shipyard Saga Iron Works Shikoku Dock Company Jinen Iron Works Tokushima Limited Sipyard Nishii Shipyard Hayashikane Heavy Industries Fukuoka Iron Works Fukushima Iron Works Funaya Iron Works Miho Shipyard Murakami Shipyard Yamanishi Iron Works Yonago Shipyard Fitted with armaments Kure Naval Arsenal Maizuru Naval Arsenal Sasebo Naval Arsenal Yokosuka Naval Arsenal
Operators:	Imperial Japanese Navy Japan Maritime Safety Agency Japan Coastal Safety Force (later Japan Maritime Self-Defence Force) Government of Japan Republic of China Navy People's Liberation Army Navy
Built:	1942 (?)–1945
In commission:	1943–1971
Planned:	200
Completed:	200
Lost:	81
Retired:	119
General characteristics
Type:	Submarine chaser
Displacement:	130 long tons (132 t) standard
Length:	29.20 m (95 ft 10 in) overall
Beam:	5.65 m (18 ft 6 in)
Draught:	1.97 m (6 ft 6 in)
Propulsion:	1 × intermediate diesel shingle shaft, 400 bhp
Speed:	11.0 knots (12.7 mph; 20.4 km/h)
Range:	1,000 nmi (1,900 km) at 10.0 kn (11.5 mph; 18.5 km/h)
Complement:	32
Armament:	• 1 × 7.7 mm machine gun • 22 × depth charges • 1 × dunking hydrophone • 1 × simple sonar

The No.1 class auxiliary submarine chaser (第一号型駆潜特務艇,, Dai Ichi Gō-gata Kusen-Tokumutei^?) was a class of submarine chasers of the Imperial Japanese Navy (IJN), serving during World War II. 200 vessels were built under the Maru Kyū Programme (Ship # 500–599) and the Maru Sen Programme (Ship # 2001–2100).

Background

• In 1939, the IJN wanted the point-defence subcahser for defence of their naval bases. In 1940, they built small prototype submarine chasers (No.1182 and No.1183) from a standard wooden fishing boat.
• The IJN made a try of them, and they confirmed that it was effective subchaser. In 1941, the IJN ordered 100 vessels.
• In the wartime, their performance were good. However, they were always troubled by insect damage, because their hull was wood.
• They who survived war played an active part for minesweeping of magnetic mines.

Ships in class

Maru Kyū Programme vessels. (Ship # 500–599)

• Aomori Prefecture on 21 April 1948.
• Ministry of Education on 29 May 1948.
• Maru Sen Programme vessels. (Ship # 2001–2100)
  

  No.169, No.173, No.99 and No.234 in 1946
  • Kanagawa Prefecture on 16 February 1948.
  • No.2064 vessel (Aux. Submarine Chaser No.214), transferred to Karafuto Prefecture, before completed.
  • edit] Bibliography
    • Ships of the World special issue Vol.45, Escort Vessels of the Imperial Japanese Navy, Kaijinsha, (Japan), February 1996
    • The Maru Special-Japanese Naval Vessels No.49, Japanese submarine chasers, Ushio Shobō (Japan), March 1981