Rapid Naval Armaments Supplement Programme (Japan, 1941)

The was one of the armaments expansion plan 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).

Background

In August 1941, the IJN started building warships for war. It extended to 293 vessels, 300,000 tons.

Table of vessels

Category	Class	Vessel number(s)	Completed	Converted	Cancelled
Heavy cruiser	Ibuki	#300 - 301		#300 was converted to aircraft carrier	#301
Aircraft carrier	Unryū Unryū class aircraft carrier The were World War II Japanese aircraft carriers. 16 carriers were planned under the Maru Kyū Programme and the Kai-Maru 5 Programme . However, only 3 carriers were completed.-Design:...	#302	Unryū Japanese aircraft carrier Unryu The Japanese aircraft carrier was a fleet aircraft carrier of the Imperial Japanese Navy which served during World War II. She was commissioned on 6 August 1944 and eventually torpedoed and sunk by US submarine in the East China Sea on 19 December that same year... (#302)
Seaplane tender	Akitsushima Japanese seaplane tender Akitsushima The was a seaplane tender of the Imperial Japanese Navy, serving during the World War II from 1942 until being sunk in September 1944.-Design:In 1938, the IJN wanted to use their large-sized flying boats more effectively, because the Kawanishi H6K was the only aircraft able to hit the Pearl Harbor...	#303			#303
Fleet oiler	Kazahaya Japanese fleet oiler Kazahaya The was a Japanese fleet oiler, serving during the Second World War.-Construction:*In 1941, the IJN wanted fleet oilers for their carrier task force, because they had only the eight old, low-speed tankers. The IJN prepared sixteen Kawasaki-type tankers to solve this. However, they did not have...	#304 - 307	Kazahaya (#304)	#306 was converted to the Hayasui class	#305, 307
Fleet oiler	Hayasui Japanese fleet oiler Hayasui The was a Japanese fleet oiler of the Imperial Japanese Navy , serving during the World War II.-Construction:At first the Hayasui was one of the Kazahaya class fleet oilers...		Hayasui (#306)
Escort ship Type-A	Etorofu	#310 - 339	Etorofu (#310), Matsuwa Japanese escort ship Matsuwa was an escort ship of the Imperial Japanese Navy during World War II.On 2 August 1944 Matsuwa was torpedoed and sunk by USS Harder in Hidai Bay.... (#311), Sado (#312), Oki (#313), Mutsure (#314), Iki (#315), Tsushima Japanese escort ship Tsushima Tsushima was an escort ship of the Imperial Japanese Navy during World War II.... (#316), Wakamiya (#317), Hirado (#318), Fukae (#319), Amakusa Japanese escort ship Amakusa Amakusa was an escort ship of the Imperial Japanese Navy during World War II.... (#321), Manju (#323), Kanju (#325), Kasado (#330)	#320, #322, #324, #326 - 329 and #331 - 339 were converted to the Mikura class
Escort ship Type-B	Mikura		Mikura (#320), Miyake (#322), Awaji (#324), Nōmi (#326), Kurahashi (#327), Chiburi (#329), Yashiro (#331), Kusagaki (#334)	#328, #333 and #339 were converted to the Hiburi class #332 and #335 - 338 were converted to the Ukuru class
	Hiburi Hiburi class escort ship The was a sub class of the Mikura class escort ships of the Imperial Japanese Navy , serving during and after World War II. -Background:...		Hiburi (#328), Daitō (#333), Shōnan (#339)
	Ukuru Ukuru class escort ship The were a class of ships in the service of the Imperial Japanese Navy during World War II.The Japanese called these ships Kaibōkan, "ocean defence ships" , a name used to denote a multi-purpose vessel....		Ukuru (#332), Okinawa Japanese escort ship Okinawa Okinawa was an escort ship of the Imperial Japanese Navy during the Second World War. She belonged to the Ukuru class. The ship is most notable for its possible participation in the sinkings of two submarines.- Design and building :... (#335), Amami (#336), Aguni Japanese escort ship Aguni Aguni was a escort ship of the Imperial Japanese Navy during the Second World War. She was named after the Aguni Island. The ship was heavily damaged from a radar-guided glide bomb on 27 May 1945.... (#337), Shinnan (#338)
Destroyer Type-A	Yūgumo	#340 - 355	Hayanami Japanese destroyer Hayanami was a of the Imperial Japanese Navy.On 7 June 1944, Hayanami was torpedoed and sunk by near Tawitawi, 35 miles east of Borneo . The destroyer blew up and sank with 208 killed; 45 survivors were rescued by .... (#340), Hamanami Japanese destroyer Hamanami was a of the Imperial Japanese Navy.On 11 November 1944, Hamanami was escorting troop convoy TA No. 3 from Manila, Philippines to Ormoc. She was sunk by aircraft of Task Force 38 in Ormoc Bay, west of Leyte , with 63 killed and 42 injured. rescued 167 survivors, including ComDesDiv 32 and... (#341), Okinami Japanese destroyer Okinami was a of the Imperial Japanese Navy.On 13 November 1944, Okinami was sunk in a U.S. air raid on Manila. Suffering one direct bomb hit and several near-misses; she sank upright in shallow water eight miles west of Manila .-External links:... (#342), Kishinami Japanese destroyer Kishinami was a of the Imperial Japanese Navy.On 2 December 1944, Kishinami departed Manila, escorting Hakko Maru back to Singapore. On 4 December she was torpedoed and sunk by west of Palawan Island... (#343), Asashimo Japanese destroyer Asashimo was a of the Imperial Japanese Navy. She was sunk with all hands during Operation Ten-Go, while escaping with other escorts while both the and the were attacked and sunk by US aircraft, as were for the other destroyers.-Service career and fate:... (#344), Hayashimo Japanese destroyer Hayashimo was a of the Imperial Japanese Navy. Her name means "Return to Time of Frost".In the Battle of Leyte Gulf, Hayashimo escorted the 1st Diversion Attack Force commanded by Admiral Kurita Takeo. She was damaged on 25 October 1944 during air attacks in the Battle off Samar... (#345), Akishimo Japanese destroyer Akishimo was a of the Imperial Japanese Navy.On 10 November 1944, Akishimo was escorting troop convoy TA No. 4 from Manila to Ormoc. She suffered heavy damage in an air attack by U.S. Army B-25 Mitchells during the withdrawal: she took a direct bomb hit and lost her bow; 20 killed and 35 injured... (#346), Kiyoshimo Japanese destroyer Kiyoshimo was a of the Imperial Japanese Navy.On 26 December 1944, then with San Jose bombardment force, Kiyoshimo was crippled by two direct bomb hits in attacks by U.S. Army bombers during approach to Mindoro, Philippines, then was finished off by a torpedo from U.S. PT-223, 145 miles south of... (#347)		#348 - 355
Destroyer Type-B	Akizuki Akizuki class destroyer (1942) The was one of the primary classes of new destroyers of the Imperial Japanese Navy after 1942. The IJN called them from their plan name. They were designed to fight larger ships, aircraft and submarines....	#360 - 369	Shimotsuki Japanese destroyer Shimotsuki was an Akizuki-class destroyer of the Imperial Japanese Navy. Her name means "November".On 25 November 1944, Shimotsuki was torpedoed and sunk by 220 miles east-northeast of Singapore with heavy loss of life.-External links:*... (#360), Fuyuzuki Japanese destroyer Fuyuzuki was an Akizuki-class destroyer of the Imperial Japanese Navy. Her name means "Winter Moon".On 12 October 1944, while escorting the light cruiser from Yokosuka to the Inland Sea, she was hit on the bow by a torpedo fired from... (#361), Harutsuki* (#362), Yoizuki Japanese destroyer Yoizuki was an Akizuki-class destroyer of the Imperial Japanese Navy. Her name means "Moon Visible as Day Joins Evening". She was commissioned too late to see action in World War II.... (#363), Natsuzuki Japanese destroyer Natsuzuki Natsuzuki was an Akizuki-class destroyer of the Imperial Japanese Navy.On 5 October 1945, Natsuzuki was removed from the Navy List.On 25 August 1947, she was turned over to Great Britain. She was scrapped at Uraga, Kanagawa in 1948.... (#364), Hanazuki Japanese destroyer Hanazuki was an Akizuki-class destroyer of the Imperial Japanese Navy. Her name means " March". In June 1947, Hanazuki was turned over to United States as "DD-934", and was later sunk as target off Gotō Islands, Japan on 3 February 1948.... (#366)		#367 - 369
Cruiser submarine Type-B	I-40	#370 - 375	I-40 (#370) to I-45 (#375)
Cruiser submarine Type-C	I-16	#376 - 378	I-46 (#376) to I-48 (#378)
Cruiser submarine Type-C	S49B	#379 - 381			#379 - 381
Medium sized submarine	Ro-35	#385 - 396	Ro-44 (#385) to Ro-50 (#391), Ro-55 (#396)		#392 - 395
Medium sized submarine	Ro-100 Ro-100 class submarine The was a medium size submarine of the Imperial Japanese Navy , serving during World War II. The IJN official designation for this class was or .-Construction:...	#400 - 408	Ro-109 (#400) to Ro-117 (#408),
Minesweeper	No.19 No.19 class minesweeper The was a class of minesweepers of the Imperial Japanese Navy , serving during the World War II. 70 vessels were plannned under the Maru 4 Programme , Maru Kyū Programme and Kai-Maru 5 Programme , however, only 17 vessels were completed.-Background:* Project number I4B. Improved model of the...	#410 - 437	No.25 (#410) to No.30 (#415), No.33 (#418), No.34 (#419), No.38 (#423), No.39 (#424), No.41 (#426)		#416 - 417, #420 - 422, #425, #427 - 437
Subchaser	No.13 No.13 class submarine chaser The was a class of submarine chasers of the Imperial Japanese Navy , serving during and after World War II. There were three sub classes, however the IJN's official document calls all of them the No.13 class.-Background:...	#440 - 459	No.40 (#440) to No.58 (#458)		#459
Minelayer	Ajiro Sokuten class minelayer (1938) The was a class of minelayers of the Imperial Japanese Navy , serving during and after World War II. The class consists of three subclasses, which this article handles collectively.-Background:...	#460 - 473	Ajiro (#460)		#461 - 473
Auxiliary minesweeper	Aux. No.1 No.1 class auxiliary minesweeper The was a class of minesweepwes of the Imperial Japanese Navy , serving during World War II. 22 vessels were planned and built in 1941–43 under the Maru Rin Programme and the Maru Kyū Programme .-Background:...	#480 - 495	Aux. No.7 (#480) to Aux. No.22 (#495)
Auxiliary subchaser	Aux. No.1 No.1 class auxiliary submarine chaser The was a class of submarine chasers of the Imperial Japanese Navy , serving during World War II. 200 vessels were built under the Maru Kyū Programme and the Maru Sen Programme .-Background:...	#500 - 599	Aux. No.1 (#500) to Aux. No.100 (#599)
Patrol torpedo boat	No.10	#600	No.10 (#600)
Patrol torpedo boat	No.11	#601 - 617	No.11 (#601) to No.16 (#606)		#607 - 617

Background

Table of vessels

See also