Wartime Naval Armaments Supplement Programme

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The Wartime Naval Armaments Supplement Programme (マル戦計画, 昭和十八年度戦時艦艇建造計画, Maru Sen Keikaku, Shōwa-Jūhachi-Nendo Senji Kantei-Kenzō Keikaku) was the 1943-44 War Programme to fund the armaments expansion plan of the Imperial Japanese Navy (IJN).

Background[]

Early 1944, the IJN started building warships for war. The plan did not include any large warships which were suitable for offensive operations.

Table of vessels funded under 1944-45 Estimates[]

Category Class Vessel number(s) Completed Converted Cancelled
Military transporter 2nd class No.101 #1501–1569 and 32 vessels and 68 vessels 22 vessels were transferred to the Army. 32 vessels
Coast defence boat Type-A (steel) (jp:海防艇) #1701–1760
Minelayer Kamishima #1801–1809 Kamishima (#1801), (#1802) #1803–1809
Minoo #1821–1822 Minoo (#1821) #1822
Coast defence boat Type-B (wood) (jp:海防艇) #1851–1870
Auxiliary subchaser Aux. No.1 #2001–2100 (#2001) to (#2100)
Auxiliary patrol boat Aux. No.1 #2121–2400 (#2121) and 26 vessels #2125–2144, 2148–2150, 2155–2156, 2159–2173, 2176–2183, 2187–2203, 2207–2209, 2214–2229, 2232–2241, 2244–2252, 2261–2271, 2277–2282, 2287–2292, 2302–2310 and 2314–2400
Escort ship Type-C No.1 #2401--2532 (#2401) and 55 vessels #2446--2447, 2450--2452, 2455--2502, 2505--2506, 2515--2532 and 168 vessels
Escort ship Type-D No.2 #2701--2843 (#2701) and 66 vessels #2735, 2740, 2743--2750, 2754--2755, 2757, 2760--2761, 2764, 2768, 2770, 2773--2774, 2776, 2781--2792, 2794, 2803--2843 and 57 vessels
Military transporter 1st class No.1 #2901--2922 and 12 vessels (#2901) and 20 vessels 12 vessels
Submarine Type-D I-361 #2961 I-372 (#2961)
I-373 #2962--2967 I-373 (#2962) #2963--2967
S60 #2968--2971 #2968--2971
Submarine Type-E S54-2 #2981--3024 and 48 boats #2981--3024 and 48 boats
Patrol torpedo boat , , , , , , , , , , , , , , , , and 1540 vessels approx. 860 vessels unknown
High-speed submarine (large) I-201 #4501--4506 I-201 (#4501), I-202 (#4502), I-203 (#4503)
S56B #4507--4523 #4509--4523
Transport submarine (small) Ha-101 #4601--4612 Ha-101 (#4601),
Ha-102 (#4602),
Ha-103 (#4603),
Ha-104 (#4604),
Ha-105 (#4605),
Ha-106 (#4606),
Ha-107 (#4607),
Ha-108 (#4608),
Ha-109 (#4609),
Ha-111 (#4611) 		#4610 and #4612
Escort ship Type-B Ukuru #4701–4721 (#4701),
(#4702),
(#4703),
Kanawa (#4704),
(#4705),
(#4707),
(#4709),
(#4711),
(#4712) 		#4706, #4708, #4710 and #4713–#4721
Destroyer Type-D Matsu #4801 - 4832 (#4809), Nashi (#4810), (#4811), Enoki (#4812), Odake (#4814), (#4815) #4801–4808, 4813 and 4816–4832
Fleet oiler Hario #4901–4904 Hario (#4901) #4902–4904
High-speed submarine (small) Ha-201 #4911–4989 Ha-201 (#4911),
Ha-202 (#4912),
Ha-203 (#4913),
Ha-204 (#4914),
Ha-205 (#4915),
Ha-207 (#4917),
Ha-208 (#4918),
Ha-209 (#4919),
Ha-210 (#4920),
Ha-216 (#4926) 		#4916,
#4921 - #4925,
#4927 - #4989
(of which 11 were launched and 16 more laid down; 42 cancelled before laying down{

Table of vessels funded under 1945-46 Estimates[]

This programme was projected only, and the vessels were never ordered.

Category Class Quantity planned
High-speed submarine (large) I-201 76 vessels
Submarine Type-D I-373 140 vessels
Transport submarine (small) Ha-101 88 vessels
High-speed submarine (small) Ha-201 10 vessels
Escort ship Type-C No.1 168 vessels
Escort ship Type-D No.2 60 vessels

References[]

  • Rekishi Gunzō series, Gakken (Japan)
  • The Maru Special series,
  • Daiji Katagiri, Ship Name Chronicles of the Imperial Japanese Navy Combined Fleet, Kōjinsha (Japan), June 1988, ISBN 4-7698-0386-9
  • "The Society of Naval Architects of Japan". (SNAJ), Histories of shipbuilding in Shōwa period (1), "Hara Shobō". (Japan), September 1977
  • 大日本帝国海軍艦艇一覧 (ja)

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)
  • (Maru 5 Keikaku, 1941)
  • (Maru 6 Keikaku, 1942)
  • Modified 5th Naval Armaments Supplement Programme (Kai-Maru 5 Keikaku, 1942)
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