No.31-class patrol boat

No. 35 in 1940
Class overview
Name: No. 31-class patrol boat
Builders:
Operators:
Succeeded by:
Subclasses:
Built: 1940
In commission: 1940 1946
Planned: 6
Completed: 10
Lost: 9
Retired: 1
General characteristics No. 31 class
Type: Patrol boat
Displacement: 940 long tons (955 t) standard
Length:
  • April 1940
  • 88.39 m (290 ft 0 in) overall
Beam: 7.93 m (26 ft 0 in)
Propulsion:
  • 2 × geared turbines
  • 2 × Kampon water tube boilers
  • 2 shafts, 4,000 shp
Speed: 18.0 knots (20.7 mph; 33.3 km/h)
Armament:
General characteristics No. 46
Type: Patrol boat
Displacement: 925 long tons (940 t) standard
Length: 88.39 m (290 ft 0 in) overall
Beam: 8.08 m (26 ft 6 in)
Propulsion:
Speed: 18.0 knots (20.7 mph; 33.3 km/h)
Armament: 2 × 120 mm L/45 naval guns

The No. 31-class patrol boats (第三十一号型哨戒艇, Dai Sanjūichi Gō-gata Shōkaitei) were a class of patrol boats of the Imperial Japanese Navy (IJN), serving during World War II. 9 vessels were converted from Momi-class destroyers and 1 vessel was converted from a Wakatake-class destroyer in 1940.

Background

In 1939, the IJN was liberated from London Naval Treaty, and they built many Kagerō-class destroyers. On the other hand, aging of the Momi-class destroyers was serious. Their boilers were worn down very much because they were destroyers. Some Momi-class destroyers were not able to show 30 knots speed. The Navy General Staff made the Confidential Document No. 456. It was an order to rebuild them into patrol boats - about four Minekaze-class destroyers and six Momi-class destroyers. The IJN chose nine Momi class and one Wakatake class. Three Momis and one Wakatake were increased, because two Minekazes were decreased.

Rebuilding

Service

Ships in classes

No. 31 class

Ship Completed as destroyer Rebuilt completed Fate
Patrol Boat No. 31 [2]
ex-Kiku
10 December 1920 First quarter of 1940 at Kure Naval Arsenal.
Renamed Patrol Boat No. 31 on 31 April 1940.[3]
Sunk during the Operation Desecrate One at Palau on 30 March 1944; removed from naval ship list on 10 May 1944.
Patrol Boat No. 32
ex-Aoi
20 December 1920 First quarter of 1940 at Kure Naval Arsenal.
Renamed Patrol Boat No. 32 on 1 April 1940.
Aground during the Battle of Wake Island on 23 December 1941, later scuttled; removed from naval ship list on 10 January 1942.
Patrol Boat No. 33
ex-Hagi
20 April 1921 First quarter of 1940 at Hakodate Dock.
Renamed Patrol Boat No. 33 on 1 April 1940.
Aground during the Battle of Wake Island on 23 December 1941, later scuttled; removed from naval ship list on 10 January 1942.
Patrol Boat No. 34
ex-Susuki
25 May 1921 First quarter of 1940 at Kure Naval Arsenal.
Renamed Patrol Boat No. 34 on 1 April 1940.
Clashed with target ship Yakaze and sunk off Kavieng on 6 March 1943; removed from naval ship list on 10 January 1945.
Patrol Boat No. 35
ex-Tsuta
30 June 1921 First quarter of 1940 at Kure Naval Arsenal.
Renamed Patrol Boat No. 35 on 1 April 1940.
Sunk by air raid off Lae on 2 September 1942; removed from naval ship list on 10 February 1943.
Patrol Boat No. 36
ex-Fuji
31 May 1921 First quarter of 1940 at Kure Naval Arsenal.
Renamed Patrol Boat No. 36 on 1 April 1940.
Survived war at Surabaya. Seized by Indonesian People's Security Army in June 1946, recaptured by Royal Netherlands Navy in July 1946. Decommissioned on 10 August 1946; scrapped in 1947.
Patrol Boat No. 37
ex-Hishi
23 March 1922 First quarter of 1940 at Sasebo Naval Arsenal.
Renamed Patrol Boat No. 37 on 1 April 1940.
Heavily damaged during the Battle of Balikpapan on 24 January 1942, later scuttled removed from naval ship list on 10 April 1942.
Patrol Boat No. 38
ex-Yomogi
19 August 1922 First quarter of 1940 at Sasebo Naval Arsenal.
Renamed Patrol Boat No. 38 on 1 April 1940.
Sunk by USS Atule at Bashi Channel 20°12′N 121°51′E / 20.200°N 121.850°E / 20.200; 121.850 on 25 November 1944; removed from naval ship list on 10 March 1945.
Patrol Boat No. 39
ex-Tade
31 July 1922 First quarter of 1940 at Sasebo Naval Arsenal.
Renamed Patrol Boat No. 39 on 1 April 1940.
Sunk by USS Seawolf off Yonaguni 23°45′N 122°45′E / 23.750°N 122.750°E / 23.750; 122.750 on 23 April 1943; removed from naval ship list on 1 July 1943.

No. 46 class

No. 40 to No. 45 were a space to the vessels numbers. These numbers were going to be given to all of Wakatakes.

Ship Completed as destroyer Rebuilt completed Fate
Patrol Boat No. 46
ex-Yūgao
31 May 1924 First quarter of 1940 at Kure Naval Arsenal.
Renamed Patrol Boat No. 46 on 1 April 1940.
Sunk by USS Greenling off Minamiizu 34°30′N 138°34′E / 34.500°N 138.567°E / 34.500; 138.567 on 10 November 1944; removed from naval ship list on 10 January 1945.

Photos

See also

Footnotes

  1. About the time of their entering a dock, correct historical materials were not left.
  2. 第三十一号哨戒艇 (Dai 31 Gō Shōkaitei). The same shall apply hereinafter.
  3. 1 April 1940, Notice No. 72, Reclassified old destroyers to auxiliary boat. (昭和十五年四月一日 海軍大臣官房達第七十二号 舊驅逐艦ヲ特務艇籍ニ編入シ左ノ通命名ス 海軍大臣 吉田善吾), Minister's Secretariat, Ministry of the Navy. The same shall apply hereinafter.

Bibliography


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