No.1-class auxiliary submarine chaser

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IJN auxiliary submarine chaser No1 class 1945.jpg
No.1 class on 10 January 1945
Class overview
Name: No.1-class auxiliary submarine chaser
  • 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
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)
  • 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

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).


  • In 1939 the Imperial Japanese Navy had two diesel-engined harbour tugs, No.1182 and No.1183, (other contemporary Japanese harbour tugs were powered by Compound steam engines), built. The two tugs, which were completed in 1940,[2] These two tugs formed the basis for a class of auxiliary subchasers. They had wooden hulls and were designed so that they could be converted to fishing boats after hostilities ended.[3] I
  • 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[edit]

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

Maru Sen Programme vessels. (Ship # 2001–2100)

No.169, No.173, No.99 and No.234 in 1946


  1. ^ a b
  2. ^ Jentschura et al 1977, p. 267.
  3. ^ Jentschura et al 1977, p. 217.
  4. ^ a b c d e f g h Gardiner and Chumbley 1995, p. 221.


  • Gardiner, Robert and Stephen Chumbley. Conway's All The World's Fighting Ships 1947–1995. Annapolis, Maryland, USA: Naval Institute Press, 1995. ISBN 1-55750-132-7.
  • Jentschura, Hansgeorg, Dieter Jung and Peter Michel. Warships of the Imperial Japanese Navy, 1869–1945, Annapolis, Maryland, USA: Naval Institute Press, 1977. ISBN 0-87021-893-X
  • 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