No.4 class submarine chaser - AbsoluteAstronomy.com

The was a class of submarine chasers of the Imperial Japanese Navy

Imperial Japanese Navy

The Imperial Japanese Navy was the navy of the Empire of Japan from 1869 until 1947, when it was dissolved following Japan's constitutional renunciation of the use of force as a means of settling international disputes...

(IJN), serving during and after World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

. 9 vessels were built in 1937-39 under the Maru 3 Programme

3rd Naval Armaments Supplement Programme (Japan, 1937)

The otherwise known as the "Circle Three" Plan was the third of four expansion plans of the Imperial Japanese Navy between 1930 and the start of World War II.-Background:...

Design

Project number was K7. The No.4 class submarine chaser was reinforced model of the No.3 class
No.1 class submarine chaser
The was a class of submarine chasers of the Imperial Japanese Navy , serving during World War II. 3 vessels were built in 1933-36 under the Maru 1 Programme and the Maru 2 Programme. They have two sub classes, this article handles them collectively....

. They lifted freeboard. Other general placement were same as No.3 class.
Their design was elaborate, because the Navy Technical Department (Kampon)
Imperial Japanese Navy Technical Department
The was the externally operating division of the Ministry of the Navy of Japan responsible for the administration of naval vessel construction. From 1923 onward, it took on the role of a research institution for the research and development of naval technologies and engineering...

devoted itself to making them small. However, their designs were not able to accept the reinforcement of anti-aircraft guns and depth charges.

Ships in class

Ship #	Ship	Builder	Laid down	Launched	Completed	Fate
62	No.7	Tsurumi Iron Works	30 October 1937	10 June 1938	15 November 1938	Sunk by aircraft at east of Car Nicobar Car Nicobar Car Nicobar is the northernmost of the Nicobar Islands. It is also one of two local administrative divisions of the Indian district of Nicobar, part of the Indian union territory of Andaman and Nicobar Islands.... on 11 April 1945.
63	No.8	Tama Shipyards	10 January 1938	9 August 1938	30 November 1938	Sunk by HMS Trenchant HMS Trenchant (P331) HMS Trenchant was a British T class submarine of the Second World War.On completion she was given over to the crew of HMS Thrasher whose submarine was due for a refit.-Service:... and HMS Terrapin HMS Terrapin (P323) HMS Terrapin was a British submarine of the third group of the T class. She was built as P323 by Vickers Armstrong, Barrow and Bellis and Morcom Ltd, and launched on 31 August 1943... at Strait of Malacca Strait of Malacca The Strait of Malacca is a narrow, stretch of water between the Malay Peninsula and the Indonesian island of Sumatra. It is named after the Malacca Sultanate that ruled over the archipelago between 1414 to 1511.-Extent:... on 4 March 1945.
64	No.4	Ōsaka Iron Works, Sakurajima Factory	19 January 1938	13 September 1938	28 December 1938	Struck a naval mine and sank at Surabaya Surabaya Surabaya is Indonesia's second-largest city with a population of over 2.7 million , and the capital of the province of East Java... on 13 August 1945.
65	No.5	Mitsubishi, Yokohama Shipyard	25 January 1938	28 July 1938	6 December 1938	Scuttled by Royal Navy Royal Navy The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service... off Singapore Singapore Singapore , officially the Republic of Singapore, is a Southeast Asian city-state off the southern tip of the Malay Peninsula, north of the equator. An island country made up of 63 islands, it is separated from Malaysia by the Straits of Johor to its north and from Indonesia's Riau Islands by the... on 11 July 1946. Decommissioned on 10 August 1946.
66	No.11	Tsurumi Iron Works	19 January 1938	28 June 1938	2 February 1939	Sunk by aircraft at west of Buka Island Buka Island Buka Island is the second largest island in the Papua New Guinean province of Bougainville.- History :Buka was first occupied by humans in paleolithic times, some 30,000 years ago... on 6 November 1943.
67	No.12	Tama Shipyards	15 July 1938	8 February 1939	30 April 1939	Sunk by unknown submarine at east of Mindanao Mindanao Mindanao is the second largest and easternmost island in the Philippines. It is also the name of one of the three island groups in the country, which consists of the island of Mindanao and smaller surrounding islands. The other two are Luzon and the Visayas. The island of Mindanao is called The... on 13 July 1944. Decommissioned on 30 September 1945.
68	No.10	Ōsaka Iron Works, Sakurajima Factory	16 September 1938	31 January 1939	15 June 1939	Aground at Angaur Angaur Angaur or Ngeaur is an island in the island nation of Palau. The island, which forms its own state, has an area of 8 km² . Its population is 188 . State capital is the village of Ngeremasch on the western side... on 2 May 1944. Later scuttled.
69	No.9	Mitsubishi, Yokohama Shipyard	10 May 1938	15 October 1938	9 May 1939	Decommissioned on 20 December 1945. Surrendered to Republic of China Republic of China The Republic of China , commonly known as Taiwan , is a unitary sovereign state located in East Asia. Originally based in mainland China, the Republic of China currently governs the island of Taiwan , which forms over 99% of its current territory, as well as Penghu, Kinmen, Matsu and other minor... on 3 October 1947, and renamed Haida. Renamed Fuling (PC-107) in January 1951. Renamed Minjiang in 1954. Decommissioned ni 1960.
70	No.6	Tsurumi Iron Works	5 July 1938	6 February 1939	20 May 1939	Heavy damaged by aircraft at Palau Palau Palau , officially the Republic of Palau , is an island nation in the Pacific Ocean, east of the Philippines and south of Tokyo. In 1978, after three decades as being part of the United Nations trusteeship, Palau chose independence instead of becoming part of the Federated States of Micronesia, a... on 30 March 1944. Later sank in shallow water.

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