No.1-class patrol boat

Class overview

Name:	No.1-class patrol boat
Builders:	Yokosuka Naval Arsenal
Operators:	Imperial Japanese Navy
Succeeded by:	Matsu-class destroyer No.1-class landing ship
Built:	1940
In commission:	1940 – 1945
Planned:	4
Completed:	2
Cancelled:	2 (replaced by 4 × No.31-class patrol boats)
Lost:	2
General characteristics
Type:	Patrol boat
Displacement:	1,270 long tons (1,290 t) standard
Length:	April 1940 102.57 m (336 ft 6 in) overall
Beam:	8.92 m (29 ft 3 in)
Propulsion:	2 × Mitsubishi-Parsons geared turbines 2 × Kampon water tube boilers 2 shafts, 10,000 shp
Speed:	22.0 knots (25.3 mph; 40.7 km/h)
Armament:	April 1940 3 × 120 mm (4.7 in) L/45 naval guns 2 × 533 mm (21.0 in) torpedo tubes 2 × 533 mm torpedoes Late 1941 2 × 120 mm (4.7 in) L/45 naval guns 4 × Type 96 25 mm AA guns 2 × depth charge throwers 18 × depth charges 2 × landing craft and 250 troops, or 42 × depth charges

The No. 1-class patrol boat (第一号型哨戒艇,, Dai Ichi Gō-gata Shōkaitei) was a class of patrol boats of the Imperial Japanese Navy (IJN), serving during World War II. 2 vessels were converted from Minekaze-class destroyers 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 Minekaze-class destroyers was serious. Their boilers were worn down very much because they were destroyers. Some Minekazes were not able to show 30 knots speed. The Navy General Staff made Confidential Document No.456, an order to rebuild about four Minekaze-class destroyers and six Momi-class destroyers into patrol boats. The IJN chose Shimakaze and Nadakaze among the Minekaze class.

Rebuilt

Shimakaze and Nadakaze were sent to Yokosuka Naval Arsenal for rebuilding. B turret, four torpedo tubes, and two boilers were removed in 1940. In this point in time, they left a feature of the destroyer.
Second half of 1941, the IJN rebuilt them once again for war preparations.^[1] They were rebuilt to the landing craft carrier. They were removed Y turret and torpedo tubes, and the enclosed well deck. Furthermore, a slope for Daihatsu-class landing craft was installed at the stern. Well-deck ruins were able to accommodate 250 troops (for two companies of Navy Landing Force).

Service

8 December 1941: Sortie for invasion of Batanes Islands. (No.1 and No.2)
24 December 1941: Sortie for invasion of Lamon Bay. (No.1 and No.2)
11 January 1942: Sortie for Battle of Manado. (No.1, No.2 and No.34)
12 February 1942: Sortie for invasion of Makassar. (No.1 and No.2)
20 February 1942: Sortie for invasion of Kupang. (No.1, No.2 and No.39)
(after): The IJN which finished First Phase Operations allotted them to the convoy escort operations and No.1 and No.2 were sunk by Allied submarines.

Ships in class

Ship	Completed as destroyer	Rebuilt completed	Fate
Patrol Boat No. 1 ^[2] ex-Shimakaze	15 November 1920	First quarter of 1940 at Yokosuka Naval Arsenal. Renamed Patrol Boat No. 1 on 1 April 1940.^[3]	Sunk by USS Guardfish at west off Kavieng 02°51′S 149°43′E / 2.850°S 149.717°E / -2.850; 149.717 on 12 January 1943. Decommissioned on 10 February 1943.
Patrol Boat No. 2 ex-Nadakaze	30 September 1921	First quarter of 1940 at Yokosuka Naval Arsenal. Renamed Patrol Boat No. 2 on 1 April 1940.^[3]	Sunk by HMS Stubborn at Lombok Strait 07°07′S 115°40′E / 7.117°S 115.667°E / -7.117; 115.667 on 25 July 1945. Decommissioned on 30 September 1945.

Footnotes

↑ About the time of their entering a dock, correct historical materials were not left.
↑ 第一号哨戒艇 (Dai 1 Gō Shōkaitei). The same shall apply hereinafter.
1 2 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.

Bibliography

"Rekishi Gunzō". , History of Pacific War Vol.62, "Ships of the Imperial Japanese Forces", Gakken (Japan), January 2008, ISBN 978-4-05-605008-0
Monthly 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 and patrol boats", "Ushio Shobō". (Japan), March 1981

Minekaze-class destroyers / No. 1-class patrol boats

Minekaze class

Nokaze subclass

Other operators

Republic of China Navy	Shen Yang (ex-Namikaze)

Royal Navy	(ex-Yūkaze)

Preceded by: Momi class
Followed by: Kamikaze class

List of destroyers of the Imperial Japanese Navy

Japanese auxiliary ship classes of World War II

Colliers and oilers	Notoro Ondo Sunosaki Ashizuri Kazahaya^S Hayasui^S Hario^S Muroto Teiyō Maru^S Ōse (ex-Dutch tanker Genota)^SC

Food supply ships	Mamiya^S Nosaki^S Kinesaki Irako^S Kurasaki^SC

Landing ships	No.1 No.101 Shinshū Maru^S (Army) SS (Army)

Armed merchant cruisers	Aikoku Maru^S Kongō Maru^S Noshiro Maru^S

Minelayers and cable layer	Tokiwa^SC Itsukushima^S Yaeyama^S Okinoshima^S Tsugaru^S Minoo^SC Shirataka^S Hatsutaka Tsubame Natsushima (1933) Sokuten (1938) Hirashima Ajiro^S Kamishima Hashima Sokuten (1913) Aux. No.1 Aux. No.101 (ex-HMS Barlight)^SC

Minesweepers	No.1 (1923) No.5 (1928) No.13 No.17 No.7 (1938) No.19 No.101 (ex-HMS Taitam and HMS Waglan)^C Aux. No.1 Aux. No.101 (ex-HNLMS DEFG-class) Aux. No.104 (ex-HNLMS DEFG-class)

Patrol boats	No.1^C No.31^C No.46^SC No.101 (ex-HMS Thracian)^SC No.102 (ex-USS Stewart)^SC No.103 (ex-USS Finch)^SC No.104 (ex-Dutch East Indies Valk and Arend)^C No.105 (ex-Philippine customs Arayat)^SC No.106 (ex-HNLMS Banckert (1929))^SCI No.107 (ex-USS Genesee)^SC No.109 (ex-Dutch East Indies Fazant)^SC Aux. No.1

Repair ships	Asahi^SC Akashi^S Hayase (ex-Chinese passenger Chin Kiang)^SC Hitonose (ex-ROCN Min Sheng)^SC

Seaplane tenders	Notoro Kamoi^SC Chitose Mizuho^S Nisshin^S Akitsushima^S Kamikawa Maru

Submarine chasers	No.1 No.3^S No.4 No.13 No.28 No.60 Aux. No.1 Aux. No.101 (ex-HNLMS Tjerimai)^SC Aux. No.102 (ex-HNLMS Ardjoeno class)^C Aux. No.103 (ex-HNLMS B1 class)^C Aux. No.111 (ex-HNLMS P13 or P14)^SC Aux. No.112 (ex-HNLMS A class)^C Aux. No.117 (ex-HNLMS Bantam)^C Aux. No.251 Aux. No.253^S

Submarine tenders	Komahashi^SC Jingei Taigei^S

Survey ships	Tsukushi^S Katsuriki^SC Hakusa (ex-China customs Fu Hsing)^SC

Target ships	Settsu^SC Yakaze^SC Hakachi^S Ōhama^S

Training ships	Fuji^SC Shikishima^SC Asama^SC Azuma^SC Kasuga^SC Atada (ex-ROCN Yat Sen)^SC

Others	Sōya (freighter)^SC Kashino (turret transporter)^S Ōtomari (icebreaker)^S Tategami (salvage tug) Kasashima (salvage tug) Miura (salvage tug) Kaiyō No.1 (oceanographic research ship) Asuka (traffic ship, ex-ROCN Yung Chien)^SC

S Single ship of class C Converted to ship type I Incomplete until the end of war

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