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 #15011569 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 #17011760
Minelayer Kamishima #18011809 Kamishima (#1801), Awashima (#1802) #18031809
Minoo #18211822 Minoo (#1821) #1822
Coast defence boat Type-B (wood) (jp:海防艇) No.101 #18511870
Auxiliary subchaser Aux. No.1 #20012100 Aux. No.151 (#2001) to Aux. No.250 (#2100)
Auxiliary patrol boat Aux. No.1 #21212400 Aux. No.1 (#2121) and 26 vessels #21252144, 21482150, 21552156, 21592173, 21762183, 21872203, 22072209, 22142229, 22322241, 22442252, 22612271, 22772282, 22872292, 23022310 and 23142400
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 #47014721 Inagi (#4701),
Habushi (#4702),
Ojika (#4703),
Kanawa (#4704),
Uku (#4705),
Takane (#4707),
Kuga (#4709),
Shiga (#4711),
(#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) #48014808, 4813 and 48164832
Fleet oiler Hario #49014904 Hario (#4901) #49024904
High-speed submarine (small) Ha-201 #49114989 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

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