Wartime Naval Armaments Supplement Programme

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 No.101 and 68 vessels 22 vessels were transferred to the Army. 32 vessels
Coast defence boat Type-A (steel) (jp:海防艇) No.1 #1701–1760
Minelayer Kamishima #1801–1809 Kamishima (#1801), Awashima (#1802) #1803–1809
Minoo #1821–1822 Minoo (#1821) #1822
Coast defence boat Type-B (wood) (jp:海防艇) No.101 #1851–1870
Auxiliary subchaser Aux. No.1 #2001–2100 Aux. No.151 (#2001) to Aux. No.250 (#2100)
Auxiliary patrol boat Aux. No.1 #2121–2400 Aux. No.1 (#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 No.1 (#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 No.2 (#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 No.1 (#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 PT-151, PT-201, PT-220, PT-235, PT-241, PT-301, PT-327, PT-411, PT-468, PT-469, PT-474, PT-491, PT-538, H-2, H-10, H-27, H-74 and H-101 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 Inagi (#4701),
Habushi (#4702),
Ojika (#4703),
Kanawa (#4704),
Uku (#4705),
Takane (#4707),
Kuga (#4709),
Shiga (#4711),
Iō (#4712) 		#4706, #4708, #4710 and #4713–#4721
Destroyer Type-D Matsu #4801 - 4832 Nire (#4809), Nashi (#4810), Sii (#4811), Enoki (#4812), Odake (#4814), Hatsuume (#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, Ushio Shobō
  • 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