No.1 class auxiliary patrol boat

Auxiliary Patrol Boat No.173 on 10 January 1945
Class overview
Name:	No.1 class auxiliary patrol boat
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 Government of Japan
Built:	1944–1945
In commission:	1945 (IJN)
Planned:	280
Completed:	27 (IJN)
Cancelled:	223
Lost:	5 (wartime)
Retired:	22 (IJN)
General characteristics
Type:	Patrol boat (Picket boat)
Displacement:	238 long tons (242 t) standard
Length:	28.50 m (93 ft 6 in) overall
Beam:	6.14 m (20 ft 2 in)
Draught:	2.35 m (7 ft 9 in)
Propulsion:	1 × intermediate diesel shingle shaft, 400 bhp
Speed:	9.0 knots (10.4 mph; 16.7 km/h)
Range:	4,000 nmi (7,400 km) at 8.0 kn (9.2 mph; 14.8 km/h)
Complement:	34
Armament:	• 4 × Type 96 25 mm AA guns • 12 × depth charges • 1 × Mk.13 early warning radar • 1 × Type 3 active sonar

The No.1 class auxiliary patrol boat (第一号型哨戒特務艇,, Dai Ichi Gō-gata Shōkai-Tokumutei^?) 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.

Background

• In the wartime, Japan commandeered a lot of fishing boats for picket boat, and watched the east surface of the sea of the Japan mainland. Their duties were early warning of the U.S. Task Force which came close to the Japan mainland. And some fishing boats accomplished their duties, however, it was their death and exchange.^[1] IJN decided to build a specialized picket boat, because their damages were piled up.
• The IJN intended to build 280 picket boats, however, the IJN was not able to prepare wood to build it. The IJN built only 27 vessels until the end of the war. They who survived war played an active part for minesweeping of magnetic mines with the No.1-class auxiliary submarine chasers.

Ships in class

• Yokosuka.
• Auxiliary Patrol Boat No.38, 90 % complete, scrapped in postwar.
• Ship No.2159 to No.2173, cancelled in 1945.
• Onomichi.
• Ship No.2287 to No.2292, cancelled in 1945.
• edit] Footnotes
  1. ^ example: Doolittle Raid in 1942.

  Bibliography

  • "Rekishi Gunzō". http://rekigun.net/. , History of Pacific War Vol.37, Support vessels of the Imperial Japanese Forces, Gakken (Japan), June 2002, ISBN 4-05-602780-3
  • Ships of the World special issue Vol.45, Escort Vessels of the Imperial Japanese Navy, Kaijinsha, (Japan), February 1996
  • Model Art Extra No.340, Drawings of Imperial Japanese Naval Vessels Part-1, Model Art Co. Ltd. (Japan), October 1989
  • The Maru Special, Japanese Naval Vessels No.49, Japanese submarine chasers, Ushio Shobō (Japan), March 1981