4th Naval Armaments Supplement Programme explained

The was one of the armaments expansion plan of the Imperial Japanese Navy (IJN).

Background

In 1939, the IJN started new naval armaments expansion plan. It extended to 80 warships and 75 Naval Air Groups by 1.6 billion JPY.

Table of vessels

Category	Class	Vessel number(s)	Completed	Converted	Cancelled
Training cruiser	Katori	101	Kashii (#101)
Minelayer	Hatsutaka	102	Wakataka (#102)
Combat support ship	Sunosaki	103	Sunosaki (#103)
Destroyer Type-B	Akizuki	104 - 109	Akizuki (#104), Teruzuki (#105), Suzutsuki (#106), Hatsuzuki (#107), Niizuki (#108), Wakatsuki (#109)
Battleship	Yamato	110 - 111		110 was converted to aircraft carrier	111
Aircraft carrier	Shinano		Shinano (#110)
Destroyer Type-A	Kagerō	112 - 114	Arashi (#112), Hagikaze (#113), Maikaze (#114), Akigumo (#115)	115 was converted from the Yūgumo class
	Yūgumo	115 - 129	Yūgumo (#116), Makigumo (#117), Kazagumo (#118), Naganami (#119), Makinami (#120), Takanami (#121), Ōnami (#122), Kiyonami (#123), Tamanami (#124), Suzunami (#126), Fujinami (#127)	115 was converted to the Kagerō class #125 was converted to the Shimakaze class #128 and #129 were dummy of naval budget of the Yamato-class battleships
Destroyer Type-C	Shimakaze		Shimakaze (#125)
Aircraft carrier	Taihō	130	Taihō (#130)
Seaplane tender	Akitsushima	131	Akitsushima (#131)
Light cruiser Type-B	Agano	132 - 135	Agano (#132), Noshiro (#133), Yahagi (#134), Sakawa (#135)
Light cruiser Type-C	Ōyodo	136 - 137	Ōyodo (#136)		137
Cruiser submarine Type-A	I-9	138	I-11 (#138)
Cruiser submarine Type-B	I-15	139 - 153	I-26 (#139) to I-39 (#152)	153 was dummy of naval budget of the Yamato-class battleships
Large sized submarine	I-176	154 - 163	I-176 (#154) to I-185 (#163)
Minesweeper	No.19	164 - 169	No.19 (#164) to No.24 (#169)
Minelayer	Sokuten	170 - 179	Hirashima (#170), Hōko (#171), Ishizaki (#172), Takashima (#173), Saishū (#174), Niizaki (#175), Yurijima (#176), Nuwajima (#177), Maeshima (#178)		179
Subchaser	No.13	180 - 183	No.13 (#180) to No.16 (#183)
Cable layer	Hashima	^[1]	Hashima, Tsurushima, Ōdate, Tateishi
Food supply ship	No.4006		No.4006 (later renamed Kinesaki)
	No.4007		No.4007 (later renamed Nosaki)

References

• Senshi Sōsho Vol.31, Naval armaments and war preparation (1), "Until November 1941", Asagumo Simbun (Japan), November 1969

See also

• 1st Naval Armaments Supplement Programme (Maru 1 Keikaku, 1931)
• 2nd Naval Armaments Supplement Programme (Maru 2 Keikaku, 1934)
• 3rd Naval Armaments Supplement Programme (Maru 3 Keikaku, 1937)
• Temporal Naval Armaments Supplement Programme (Maru Rin Keikaku, 1940)
• Rapidly Naval Armaments Supplement Programme (Maru Kyū Keikaku, 1941)
• Additional Naval Armaments Supplement Programme (Maru Tui Keikaku, 1941)
• 5th Naval Armaments Supplement Programme (Maru 5 Keikaku, 1941)
• 6th Naval Armaments Supplement Programme (Maru 6 Keikaku, 1942)
• Modified 5th Naval Armaments Supplement Programme (Kai-Maru 5 Keikaku, 1942)
• Wartime Naval Armaments Supplement Programme (Maru Sen Keikaku, 1944)
• マル4計画 (ja)

Notes and References

1. They do not have a vessel number(s), because they were demanded as support vessels.