Wartime Naval Armaments Supplement Programme

The {{nihongo|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 further wartime armaments expansion plans of the Imperial Japanese Navy (IJN).

Background

Due to shifting wartime circumstances, the IJN focused on the construction of auxiliary and escort ships. As a result, the Wartime Naval Armaments Supplement Programme lacked any major warships capable of offensive operations.

Table of vessels funded under 1944-45 Estimates

class="wikitable" width="90%"

| width="12%" | Category

| width="8%" | Class

| width="8%" | Vessel number(s)

| width="20%" | Completed

| width="15%" | Converted

| width="12%" | 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

|

rowspan="2"|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

rowspan="3"|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

rowspan="2"|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.

class="wikitable" width="90%"

| width="12%" | Category

| width="8%" | Class

| width="8%" | 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}}
{{cite web |url=http://www.jasnaoe.or.jp/old_sites/snaj/ |title=The Society of Naval Architects of Japan}} (SNAJ), Histories of shipbuilding in Shōwa period (1), {{cite web |url=http://www.harashobo.co.jp/ |title=Hara Shobō}} (Japan), September 1977
大日本帝国海軍艦艇一覧 (ja)

Wartime Naval Armaments Supplement Programme

Background

Table of vessels funded under 1944-45 Estimates

Table of vessels funded under 1945-46 Estimates

References

See also