Class overview | |
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Name | Kaichū type submarines |
Builders | |
Operators | ![]() |
Subclasses |
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Built | 1917-1944 |
In commission | 1919-1945 |
TheKaichū type submarine (海中型潜水艦,Kaichū-gata sensuikan) submarines were double-hulled medium-sized submarines of theImperial Japanese Navy duringWorld War II. The name was derived from theKaigun-shikiChū-gata Sensuikan (海軍式中型潜水艦,Navy Medium Type submarine).
Several variants existed. From 1934 to 1944, the K6 type (Ro-33 Class) and the K7 type (Senchū,Ro-35 Class) were built. They were equipped with a76.2 mm (3.00 in) L/40 gun and four 53 cmtorpedo tubes for tentype 95Long Lance torpedoes.
Most of these submarines were destroyed in combat, suffering from Alliedanti-submarine warfare measures, and onlyRo-50 survived the war.
TheKaichū type submarines were divided into seven classes:
Project numberS7. In 1910s, theImperial Japanese Navy (IJN) bought a license ofSchneider-Laubeuf design submarine. The IJN used the design as model and built theS Type (Schneider Type) submarine, theHa-9 andHa-10. TheKaichū I is the submarine which jumboized theS Type submarines.
Boat | Builder | Laid down | Launched | Completed | Fate |
---|---|---|---|---|---|
Submarine No. 19 Ro-11[1] | Kure Naval Arsenal | 25-04-1917 | 25-10-1917 | 31-07-1919 asSubmarine No. 19 | RenamedRo-11 01-11-1924. Decommissioned 01-04-1932. |
Submarine No. 20 Ro-12 | Kure Naval Arsenal | 25-04-1917 | 01-12-1917 | 18-09-1919 asSubmarine No. 20 | RenamedRo-12 01-11-1924. Decommissioned 01-04-1932. |
Project numberS18. TheKaichū II had an increased range compared with theKaichū I, and the turning torpedo tubes were removed.
Boat | Builder | Laid down | Launched | Completed | Fate |
---|---|---|---|---|---|
Submarine No. 23 Ro-13 | Kure Naval Arsenal | 14-09-1918 | 26-08-1919 | 30-09-1920 asSubmarine No. 23 | RenamedRo-13 01-11-1924. Decommissioned 01-04-1932. |
Submarine No. 22 Ro-14 | Kure Naval Arsenal | 14-09-1918 | 31-03-1919 | 17-02-1921 asSubmarine No. 22 | RenamedRo-14 01-11-1924. Decommissioned 01-09-1933. |
Submarine No. 24 Ro-15 | Kure Naval Arsenal | 12-06-1920 | 14-10-1920 | 30-06-1921 asSubmarine No. 24 | RenamedRo-15 01-11-1924. Decommissioned 01-09-1933. |
Project numberS18. Their project number was the same as in theKaichū II type submarine, however their performance was improved.
Boat | Builder | Laid down | Launched | Completed | Fate |
---|---|---|---|---|---|
Submarine No. 37 Ro-16 | Kure Naval Arsenal | 18-11-1920 | 22-04-1921 | 29-04-1922 asSubmarine No. 37 | RenamedRo-16 01-11-1924. Decommissioned 01-09-1933. |
Submarine No. 34 Ro-17 | Kure Naval Arsenal | 24-09-1920 | 24-02-1921 | 20-10-1921 asSubmarine No. 34 | RenamedRo-17 01-11-1924. Decommissioned 01-04-1936. |
Submarine No. 35 Ro-18 | Kure Naval Arsenal | 20-10-1920 | 25-03-1921 | 15-12-1921 asSubmarine No. 35 | RenamedRo-18 01-11-1924. Decommissioned 01-04-1936. |
Submarine No. 36 Ro-19 | Kure Naval Arsenal | 09-09-1920 | 28-12-1920 | 15-03-1922 asSubmarine No. 36 | RenamedRo-19 01-11-1924. Decommissioned 01-04-1936. |
Submarine No. 38 Ro-20 | Yokosuka Naval Arsenal | 28-07-1919 | 26-10-1920 | 01-02-1922 asSubmarine No. 38 | RenamedRo-20 01-11-1924. Decommissioned 01-04-1934. |
Submarine No. 39 Ro-21 | Yokosuka Naval Arsenal | 28-07-1919 | 26-10-1920 | 01-02-1922 asSubmarine No. 39 | RenamedRo-21 01-11-1924. Decommissioned 01-04-1934. |
Submarine No. 40 Ro-22 | Yokosuka Naval Arsenal | 22-01-1921 | 15-10-1921 | 10-10-1922 asSubmarine No. 40 | RenamedRo-22 01-11-1924. Decommissioned 01-04-1934. |
Submarine No. 41 Ro-23 | Yokosuka Naval Arsenal | 22-01-1921 | 15-10-1921 | 28-04-1923 asSubmarine No. 41 | RenamedRo-23 01-11-1924. Decommissioned 01-04-1935. |
Submarine No. 42 Ro-24 | Sasebo Naval Arsenal | 21-04-1919 | 08-12-1919 | 30-11-1920 asSubmarine No. 42 | RenamedRo-24 01-11-1924. Decommissioned 01-04-1935. |
Submarine No. 43 Ro-25 | Sasebo Naval Arsenal | 19-02-1920 | 17-07-1920 | 25-10-1921 asSubmarine No. 43 | RenamedRo-25 01-11-1924. Decommissioned 01-04-1936. |
Project numberS18A. Improved model from theKaichū III type.
Boat | Builder | Laid down | Launched | Completed | Fate |
---|---|---|---|---|---|
Submarine No. 45 Ro-26 | Sasebo Naval Arsenal | 10-03-1921 | 18-10-1921 | 25-01-1923 asSubmarine No. 45 | RenamedRo-26 01-11-1924. Decommissioned 01-04-1940. Scrapped 1948. Her anchor is displaying atYokosuka Naval Base. |
Submarine No. 58 Ro-27 | Yokosuka Naval Arsenal | 16-07-1921 | 22-07-1922 | 31-07-1924 asSubmarine No. 58 | RenamedRo-27 01-11-1924. Decommissioned 01-04-1936. Scrapped 1948. |
Submarine No. 62 Ro-28 | Sasebo Naval Arsenal | 10-11-1921 | 13-04-1922 | 30-11-1923 asSubmarine No. 62 | RenamedRo-28 01-11-1924. Decommissioned 01-04-1940. Scrapped 1948. |
Project numberS18B. They were built for thecommerce raiding role. The IJN official designation of these boats wasSpecial Purpose-Medium Type submarine (特中型潜水艦,Toku-Chū-gata sensuikan).
Boat | Builder | Laid down | Launched | Completed | Fate |
---|---|---|---|---|---|
Submarine No. 68 Ro-29 | Kawasaki-Kōbe Shipyard | 02-06-1921 | 05-12-1922 | 15-09-1923 asSubmarine No. 68 | RenamedRo-29 01-11-1924. Decommissioned 01-04-1936. |
Submarine No. 69 Ro-30 | Kawasaki-Kōbe Shipyard | 27-06-1921 | 18-01-1923 | 29-04-1924 asSubmarine No. 69 | RenamedRo-30 01-11-1924. Decommissioned 01-04-1942. Scrapped 1945. |
Submarine No. 70 | Kawasaki-Kōbe Shipyard | 25-09-1921 | 15-02-1923 asSubmarine No. 70 | Lost in an accident offAwaji Island 21-08-1923. Salvaged and scrapped October 1923. Her materials were used forRo-31. | |
Ro-31 | Kawasaki-Kōbe Shipyard | 20-12-1924 | 25-09-1926 | 10-05-1927 | Decommissioned 25-05-1945. Scuttled offSasebo 05-04-1946. |
Submarine No. 71 Ro-32 | Kawasaki-Kōbe Shipyard | 24-10-1921 | 19-03-1923 | 21-05-1924 asSubmarine No. 71 | RenamedRo-32 01-11-1924. Decommissioned 01-04-1942. Scrapped 1945. |
Project numberS30. They were planned as a prototype for a mass production submarines in the wartime under theMaru 1 Programme.
Boat | Builder | Laid down | Launched | Completed | Results | Fate |
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Ro-33 | Kure Naval Arsenal | 08-08-1933 | 10-10-1934 | 07-10-1935 | Sank Australian merchant shipMV Mamutu 07-08-1942 | Sunk byHMAS Arunta and RAF patrol aircraft offPort Moresby 29-08-1942. |
Ro-34 | Mitsubishi-Kōbe Shipyard | 25-04-1934 | 12-12-1935 | 31-05-1937 | Sunk byUSS O'Bannon andUSS Strong nearRussell Islands 06-04-1943. |
Project numberS44. The final design in theKaichū series. They were equipped with a Freon air-conditioner, because the IJN took into consideration that they were to be active on the equator area too. The official IJN designation of these boats wasMedium Type submarine (中型潜水艦,Chū-gata sensuikan), also called for short,Medium Type (中型,Chū-gata) orSubmarine-Medium Type (潜中型,Sen-Chū-gata).
The IJN planned to build these boats under the following Naval Armaments Supplement Programmes:
However some of the boats were cancelled and their naval budgets, materials and staffs were transferred to theI-201 class submarines.
Boat No. | Boat | Builder | Laid down | Launched | Completed | Results | Fate |
---|---|---|---|---|---|---|---|
201 | Ro-35 | Mitsubishi-Kōbe Shipyard | 09-10-1941 | 09-06-1942 | 25-03-1943 | Sunk byUSS Patterson near ofEspiritu Santo 25-08-1943. | |
202 | Ro-36 | Mitsubishi-Kōbe Shipyard | 07-03-1942 | 14-10-1942 | 27-05-1943 | Sunk byUSS Melvin north ofSaipan 13-06-1944. | |
203 | Ro-37 | Sasebo Naval Arsenal | 09-10-1941 | 30-06-1942 | 30-06-1943 | DamagedUSS Cache 22-01-1944 | Sunk byUSS Buchanan near ofSanta Cruz Islands11°47′S164°17′E / 11.783°S 164.283°E /-11.783; 164.283 22-01-1944. |
204 | Ro-38 | Mitsubishi-Kōbe Shipyard | 20-06-1942 | 24-12-1942 | 24-07-1943 | Disappeared after 19-11-1943. | |
205 | Ro-39 | Mitsubishi-Kōbe Shipyard | 08-08-1942 | 06-03-1943 | 12-09-1943 | Sunk byUSS Charrette andUSS Fair east ofWotje Atoll06°48′N168°08′E / 6.800°N 168.133°E /6.800; 168.133 03-02-1944. | |
206 | Ro-40 | Mitsubishi-Kōbe Shipyard | 08-08-1942 | 06-03-1943 | 28-09-1943 | Sunk byUSS Phelps north ofMarshall Islands09°50′N166°35′E / 9.833°N 166.583°E /9.833; 166.583 16-02-1944. | |
207 | Ro-41 | Mitsubishi-Kōbe Shipyard | 06-10-1942 | 05-05-1943 | 26-11-1943 | SankUSS Shelton 03-10-1944 | Sunk byUSS Haggard south ofOkinawa22°57′N132°19′E / 22.950°N 132.317°E /22.950; 132.317 23-03-1945. |
208 | Ro-42 | Sasebo Naval Arsenal | 27-04-1942 | 25-10-1942 | 31-08-1943 | Sunk byUSS Bangust northeast of Marshall Islands10°05′N168°22′E / 10.083°N 168.367°E /10.083; 168.367 10-06-1945. | |
209 | Ro-43 | Mitsubishi-Kōbe Shipyard | 06-10-1942 | 05-06-1943 | 16-12-1943 | DamagedUSS Renshaw 21-02-1945 | Sunk by aircraft fromUSS Anzio offIwo Jima25°07′N140°19′E / 25.117°N 140.317°E /25.117; 140.317 27-02-1945. |
385 | Ro-44 | Mitsui-Tamano Shipyard | 14-02-1942 | 11-11-1942 | 13-09-1943 | Sunk byUSS Burden R. Hastings near ofEnewetak11°13′N164°15′E / 11.217°N 164.250°E /11.217; 164.250 16-06-1944. | |
386 | Ro-45 | Mitsubishi-Kōbe Shipyard | 20-10-1942 | 21-07-1943 | 11-01-1944 | Sunk byUSS Macdonough,USS Stephen Potter and aircraft fromUSS Monterey south ofTruk06°13′N151°19′E / 6.217°N 151.317°E /6.217; 151.317 01-05-1944. | |
387 | Ro-46 | Mitsui-Tamano Shipyard | 13-06-1942 | 23-04-1943 | 19-02-1944 | DamagedUSS Cavalier 29-01-1945 | Sunk by aircraft fromUSS Tulagi near ofOki Daitō24°15′N131°16′E / 24.250°N 131.267°E /24.250; 131.267 29-04-1945. |
388 | Ro-47 | Mitsubishi-Kōbe Shipyard | 28-12-1942 | 20-08-1943 | 31-01-1944 | Sunk byUSS McCoy Reynolds northeast ofPalau09°19′N136°44′E / 9.317°N 136.733°E /9.317; 136.733 26-09-1944. | |
389 | Ro-48 | Mitsubishi-Kōbe Shipyard | 17-03-1943 | 15-10-1943 | 31-03-1944 | (1) Sunk byUSS William C. Miller northwest of Saipan 14-07-1944. (2) Sunk byUSS Wyman northwest of Saipan 18-07-1944. | |
390 | Ro-49 | Mitsui-Tamano Shipyard | 16-11-1942 | 03-08-1943 | 19-05-1944 | Sunk byUSS Hudson. | |
391 | Ro-50 | Mitsui-Tamano Shipyard | 18-02-1943 | 27-11-1943 | 31-07-1944 | Sank USSLST-577 11-02-1945 | Decommissioned 30-11-1945. Sunk as target offGotō Islands 01-04-1946. |
392 - 395 | Cancelled in 1943. | ||||||
396 | Ro-55 | Mitsui-Tamano Shipyard | 05-08-1943 | 23-04-1944 | 30-09-1944 | Sunk byUSS Thomason west ofLuzon15°27′N119°25′E / 15.450°N 119.417°E /15.450; 119.417 07-02-1945. | |
640 - 644 | Cancelled in 1943. | ||||||
645 | Ro-56 (ex-Ro-75) | Mitsui-Tamano Shipyard | 02-12-1943 asRo-75 | 05-07-1944 | 15-11-1944 | Sunk byUSS Mertz andUSS Monssen near of Oki Daitō26°09′N130°21′E / 26.150°N 130.350°E /26.150; 130.350 09-04-1945. | |
646 - 654 | Cancelled in 1943. | ||||||
5181 - 5223 | Cancelled in 1943. |
Type | Kaichū I (Ro-11) | Kaichū II (Ro-13) | Kaichū III (Ro-16) | Kaichū IV (Ro-26) | |
Displacement | Surfaced | 720 long tons (732 t) | 740 long tons (752 t) | 740 long tons (752 t) | 750 long tons (762 t) |
Submerged | 1,000 long tons (1,016 t) | 1,003.1 long tons (1,019 t) | 997 long tons (1,013 t) | 1,080 long tons (1,097 t) | |
Length (overall) | 69.19 m (227 ft 0 in) | 70.10 m (230 ft 0 in) | 70.10 m (230 ft 0 in) | 74.22 m (243 ft 6 in) | |
Beam | 6.35 m (20 ft 10 in) | 6.10 m (20 ft 0 in) | 6.12 m (20 ft 1 in) | 6.12 m (20 ft 1 in) | |
Draft | 3.43 m (11 ft 3 in) | 3.68 m (12 ft 1 in) | 3.70 m (12 ft 2 in) | 3.73 m (12 ft 3 in) | |
Power plant and shaft | 2 ×Sulzer Mk.2 diesels 2 shafts | 2 × Sulzer Mk.2 diesels 2 shafts | 2 × Sulzer Mk.2 diesels 2 shafts | 2 × Sulzer Mk.2 diesels 2 shafts | |
Power | Surfaced | 2,900 bhp | 2,900 bhp | 2,900 bhp | 2,900 bhp |
Submerged | 1,200 shp | 1,200 shp | 1,200 shp | 1,200 shp | |
Speed | Surfaced | 18.2knots (33.7 km/h) | 16.5knots (30.6 km/h) | 16.5knots (30.6 km/h) | 16.0knots (29.6 km/h) |
Submerged | 9.1knots (16.9 km/h) | 8.5knots (15.7 km/h) | 8.5knots (15.7 km/h) | 8.5knots (15.7 km/h) | |
Range | Surfaced | 4,000 nmi (7,400 km) at 10 knots (19 km/h) | 6,000 nmi (11,000 km) at 10 knots (19 km/h) | 6,000 nmi (11,000 km) at 10 knots (19 km/h) | 6,000 nmi (11,000 km) at 10 knots (19 km/h) |
Submerged | 85 nmi (157 km) at 4 knots (7.4 km/h) | 85 nmi (157 km) at 4 knots (7.4 km/h) | 85 nmi (157 km) at 4 knots (7.4 km/h) | 85 nmi (157 km) at 4 knots (7.4 km/h) | |
Test depth | 30 m (98 ft) | 30 m (98 ft) | 45.7 m (150 ft) | 45.7 m (150 ft) | |
Fuel | 58.4 tons | 75 tons | 75 tons | 75 tons | |
Complement | 43 | 43 | 46 | 46 | |
Armament (initial) | • 6 × 450 mm (18 in)TTs (4 × front, 2 × turret) • 10 × Type 44 torpedoes • 1 ×76.2 mm (3.00 in)L/23.5 5th Year Type AA gun | • 6 × 450 mm (18 in) TTs (4 × front, 2 × upper deck) • 10 × Type 44 torpedoes • 1 × 76.2 mm (3.00 in) L/23.5 5th Year Type AA gun | • 6 × 450 mm (18 in) TTs (4 × front, 2 × upper deck) • 10 × Type 44 torpedoes • 1 × 76.2 mm (3.00 in) L/23.5 5th Year Type AA gun | • 4 × 533 mm (21 in) TTs (4 × front) • 8 ×6th Year Type torpedoes • 1 × 76.2 mm (3.00 in) L/23.5 5th Year Type AA gun |
Type | Kaichū V (Ro-29) | Kaichū VI (Ro-33) | Kaichū VII (Ro-35) | |
Displacement | Surfaced | 852 long tons (866 t) | 700 long tons (711 t) | 960 long tons (975 t) |
Submerged | 1,030 long tons (1,047 t) | 1,200 long tons (1,219 t) | 1,447 long tons (1,470 t) | |
Length (overall) | 74.22 m (243 ft 6 in) | 73.00 m (239 ft 6 in) | 80.50 m (264 ft 1 in) | |
Beam | 6.12 m (20 ft 1 in) | 6.70 m (22 ft 0 in) | 7.05 m (23 ft 2 in) | |
Draft | 3.73 m (12 ft 3 in) | 3.25 m (10 ft 8 in) | 4.07 m (13 ft 4 in) | |
Power plant and shaft | 2 × Sulzer Mk.1 diesels 2 shafts | 2 ×Kampon Mk.21 Model 8 diesels 2 shafts | 2 × Kampon Mk.22 Model 10 diesels 2 shafts | |
Power | Surfaced | 1,200 bhp | 3,000 bhp | 4,200 bhp |
Submerged | 1,200 shp | 1,200 shp | 1,200 shp | |
Speed | Surfaced | 13.0knots (24.1 km/h) | 19.0knots (35.2 km/h) | 19.8knots (36.7 km/h) |
Submerged | 8.5knots (15.7 km/h) | 8.2knots (15.2 km/h) | 8.0knots (14.8 km/h) | |
Range | Surfaced | 6,000 nmi (11,000 km) at 10 knots (19 km/h) | 8,000 nmi (15,000 km) at 12 knots (22 km/h) | 5,000 nmi (9,300 km) at 16 knots (30 km/h) |
Submerged | 85 nmi (157 km) at 4 knots (7.4 km/h) | 90 nmi (170 km) at 3.5 knots (6.5 km/h) | 45 nmi (83 km) at 5 knots (9.3 km/h) | |
Test depth | 45.7 m (150 ft) | 75 m (246 ft) | 80 m (260 ft) | |
Fuel | 143 tons | 109 tons | 218 tons | |
Complement | 44 | 61 | 61 | |
Armament (initial) | • 4 × 533 mm (21 in) TTs (4 × front) • 8 × 6th Year Type torpedoes • 1 ×120 mm (4.7 in) L/45 11th Year Type Naval gun • 1 × 6.5 mm machine gun | • 4 × 533 mm (21 in) TTs (4 × front) • 8 × Type 89 torpedoes • 1 ×76.2 mm (3.00 in) L/40 11th Year Type AA gun • 1 ×13.2 mm (0.52 in) Type 93 AA gun | • 4 × 533 mm (21 in) TTs (4 × front) • 10 ×Type 95 torpedoes • 1 × 76.2 mm (3.00 in) L/40 11th Year Type AA gun • 2 ×Type 96 25mm AA guns |