The , , was one of the wartime armaments expansion plans of the Imperial Japanese Navy (IJN).
Background In September 1942, after being defeated in the Battle of Midway, the IJN drew up a new armaments expansion plan. This plan was combined by the 5th Naval Armaments Supplement Programme and the 6th Naval Armaments Supplement Programme to build the aircraft carriers rapidly. The main article was to build 20 aircraft carriers, and removed all battleships and heavy cruisers. Because of the need to protect convoys against Allied submarines some 72 destroyers were added to the programme and due to recent successes by Japanese submarines against Allied carriers some 96 large submarines were included.
They had approved 412 vessels, 1,150,000 tons. However, most of plans were not achieved. Until the end of the war only 60 vessels from this plan were completed.
Table of vessels Category Class Vessel number(s) Completed Converted CancelledAircraft carrier Unryū #5001–5015 Amagi (#5001), Katsuragi (#5003) #5002 and #5005 were converted to the Shinano #5008–5015 G15 (Modified Taiho) #5021–5025 #5021–5025 Seaplane tender Akitsushima #5031–5033 #5031–5033 Submarine tender J27 #5034–5036 #5034–5036 Light cruiser C44 #5037–5038 #5037–5038 Minelayer H12C #5039 #5039 Destroyer Type-A Yūgumo #5041–5048 #5041–5048 Destroyer Type-B Akizuki #5061–5083 #5061–5083Cruiser submarine Type-A I-13 #5091–5093 I-14 (#5091) S48 #5094–5096 #5094–5096Cruiser submarine Type-B I-54 #5101–5114 #5101–5114 S49A #5115–5132 #5115–5132Cruiser submarine Type-C I-52 #5141–5155 #5141–5155 S49B #5156–5180 #5156–5180 Medium-sized submarine Ro-35 #5181–5223 #5181–5223 Submarine Special type I-400 #5231–5248 I-400 (#5231), I-401 (#5232), I-402 (#5233) #5234–5248Escort ship Type-B Ukuru #5251–5284 Yaku (#5251), Chikubu (#5253), Kōzu (#5255), Hodaka (#5256), Ikara (#5258), Ikuno (#5260) #5252, 5254, 5257, 5259 and 5263–5266 were converted to the Hiburi class #5261–#5262, 5267–5284 Hiburi Kume (#5252), Ikuna (#5254), Shisaka (#5257), Sakito (#5259), Mokuto (#5263), Habuto (#5264) #5265–5266 Minesweeper No.19 #5301–5336 #5301–5336 Subchaser No.13 #5341–5370 No.60 (#5341), No.61 (#5342), No.63 (#5344) #5343, 5345–5370Fleet oiler Kazahaya #5381–5387 #5381–5387 J34 #5388–5395 #5388–5395Food supply ship Kinesaki #5401–5407 #5401–5407 J20C #5408 #5408 J35 #5409–5410 #5409–5410 Target ship Ōhama #5411–5415 Ōhama (#5411) #5412–5415 Repair ship Akashi #5416–5417 #5416–5417 Survey ship J11C #5418 #5418 Icebreaker J23 #5419 #5419 Minelayer Ajiro #5421–5432 #5421–5432 Submarine Type-D I-361 #5461–5471 I-361 (#5461), I-362 (#5462), I-363 (#5463), I-364 (#5464), I-365 (#5465), I-366 (#5466), I-367 (#5467), I-368 (#5468), I-369 (#5469), I-370 (#5470), I-371 (#5471) Destroyer Type-D Matsu #5481–5522 Matsu (#5481), Take (#5482), Ume (#5483), Momo (#5484), Kuwa (#5485), Kiri (#5486), Sugi (#5487), Maki (#5488), Momi (#5489), Kashi (#5490), Kaya (#5492), Nara (#5493), Sakura (#5496), Yanagi (#5497), Tsubaki (#5498), Kaki (#5499), Kaba (#5500), Hinoki (#5502), Kaede (#5505), Keyaki (#5508), Tachibana (#5511), Tsuta (#5514), Hagi (#5517), Sumire (#5520), Kusunoki (#5521), Hatsuzakura (#5522) #5491, 5494–5495, 5501, 5503–5504, 5506–5507, 5509–5510, 5512–5513, 5515–5516, 5518–5519
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) 4th Naval Armaments Supplement Programme (Maru 4 Keikaku, 1939) 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) Wartime Naval Armaments Supplement Programme (Maru Sen Keikaku, 1944)
References
改マル5計画 (ja)