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fighting ships of the world

IMPERIAL JAPANESE NAVY (JAPAN)

SUBMARINES

"Otsu-gata B1" cruiser submarines (1940-1943)

I35 1942

I35 1943

Name No Yard No Builder Laid down Launched Comp Fate
15 [I15]     Kure K K 1/1938 7.3.1939 9.1940 sunk 10.11.1942
17 [I17]     Yokosuka K K 4/1938 19.7.1939 1.1941 sunk 19.8.1943
19 [I19]     Mitsubishi, Kobe 3/1938 16.9.1939 4.1941 sunk 25.11.1943
21 [I21]     Kawasaki, Kobe 1/1939 24.2.1940 7.1941 sunk 29.11.1943
23 [I23]     Yokosuka K K 1/1939 24.11.1939 9.1941 sunk 18.2.1942
25 [I25]     Mitsubishi, Kobe 2/1939 8.6.1940 10.1941 sunk 3.9.1943
26 [I26]     Kure K K 7/1939 10.4.1940 11.1941 sunk 24.10.1944
27 [I27]     Sasebo K K 7/1939 6.6.1940 2.1942 sunk 12.2.1944
28 [I28]     Mitsubishi, Kobe 9/1939 18.12.1940 2.1942 sunk 17.5.1942
29 [I29]     Yokosuka K K 9/1939 29.9.1940 2.1942 sunk 26.7.1944
30 [I30]     Kure K K 6/1939 17.9.1940 2.1942 sunk 13.10.1942
31 [I31]     Yokosuka K K 12/1939 13.3.1941 5.1942 sunk 13.6.1943
32 [I32]     Sasebo K K 1/1940 17.12.1940 4.1942 sunk 24.3.1944
33 [I33]     Mitsubishi, Kobe 2/1940 1.5.1941 6.1942 wrecked 13.6.1944
34 [I34]     Sasebo K K 1/1941 24.9.1941 8.1942 sunk 13.11.1943
35 [I35]     Mitsubishi, Kobe 9/1940 24.9.1941 8.1942 sunk 22.11.1943
36 [I36]     Yokosuka K K 12/1940 1.11.1941 9.1942 surrendered 8.1945, scuttled 1.4.1946
37 [I37]     Kure K K 12/1940 22.10.1941 3.1943 sunk 19.11.1944
38 [I38]     Sasebo K K 6/1941 15.4.1942 1.1943 sunk 12.11.1944
39 [I39]     Sasebo K K 6/1941 15.4.1942 4.1943 sunk 26.11.1943

  

Displacement standard, t

2198

Displacement normal, t

2589 / 3654

Length, m

102.4 pp 106.9 wl 108.7 oa

Breadth, m

9.30

Draught, m

5.14

No of shafts

2

Machinery

2 Kampon diesels / 2 electric motors

Power, h. p.

12400 / 2000

Max speed, kts

23.6 / 8

Fuel, t

diesel oil 220

Endurance, nm(kts) 14000(16) / 96(3)
Armament

most: 1 x 1 - 140/40 11-shiki, 1 x 2 - 25/60 96-shiki, 6 - 533 TT (bow,17), 1 catapult, 1 seaplane (E14Y1)

some: 2 x 1 - 140/40 11-shiki, 1 x 2 - 25/60 96-shiki, 6 - 533 TT (bow, 17)

Electronic equipment 93-shiki sonar, 93-shiki hydrophone

Complement

101

Diving depth operational, m

100

Project history: Otsu-Gata B1 type. Built under 3rd and 4th Supplementary programmes of 1937 and 1939. As design basis Kaidal 6b submarine was used with aviation armament as on Ko-Gata A1 type. Submarines of new "Model B" type (Otsu-Gata) differed from predecessors by more streamlined forms of hull and "CT-hangar" complex. Since Otsu-Gata there was an actual confluence of cruiser and fleet submarines development lines, as these boats intended both for long-range reconnaissance and for actions together with the surface forces. Double-hulled, endurance was about 90 days.

I17 differed from sisterships, that the hangar and a catapult placed aft from CT (accordingly 140mm gun was fitted fwd).

Part of submarines was completed under changed design: second 140mm gun fwd from CT was installed instead of hangar and catapult.

Modernizations: 1943-44, some survived: + 2-shiki 2-go radar

Autumn 1944, I36, 37: - 1 x 1 - 140/40, 1 seaplane, 1 catapult and hangar; + 1 x 2 - 25/60 96-shiki, 4 Kaiten human torpedoes

late 1944, I36: + 2 Kaiten human torpedoes

Naval service: I23 after 15.2.1942 was lost S off Oahu (Hawaii), possibly she was sunk by US aircraft 26.2.1942. I28 17.5.1942 was sunk at Truck by US submarine Tautog. I30 13.10.1942 on approaches to Singapore was stricken by British mine and sunk, subsequently she was salvaged and broken up. I15 was sunk 10.11.1942 N off San Christobal by US destroyer-minesweeper Southard (under other data, she was sunk 2.11.1942 in the same place by US destroyer McCalla). I31 after 13.5.1943 was lost, possibly she was sunk 13.6.1943 N off Kiska by US destroyer Frazier. I17 was sunk 19.8.1943 SE off New Caledonia by New Zealand corvette Tui and US aircraft. I25 after 24.8.1943 was lost, under miscellaneous versions, she was mined at Espirito Santo in early September, 1943, or sunk NE off Espirito Santo 3.9.1943 by US destroyer Ellett. I34 was sunk 13.11.1943 at Penang by British submarine Taurus. I35 was sunk 22.11.1943 at Tarawa by US destroyers Meade and Frazier. I19 was sunk 25.11.1943 off Gilbert Islands by US destroyer Radford. I21 after 27.11.1943 was lost, possibly sunk 29.11.1943 at Tarawa by US carrier aircraft. I39 after 3.12.1943 was lost, presumably sunk 23.12.1943 by US escort destroyer Griswold in Solomons area. I27 was sunk 12.2.1944 NW off Addu (Maldives) by British destroyers Petard and Paladin. I32 was sunk 24.3.1944 in Marshall Islands area by US destroyers Halsey Powell, Hull, escort destroyer Manlove and patrol craft ΠΡ1135. I33 was foundered 26.9.1942 at Truck on shallow water as result of accident during after repair trials, salvaged 29.12.1942 and was under repair till May, 1944, she was foundered again on shallow water, having received a breach as a result of navigating accident 13.6.1944 during gears tests off Kure, secondary raised in July, 1953 and handed over on demolition. I29 was sunk 26.6.1944 at Philippines by US submarine Sawfish. I26 was sunk 24.10.1944 at Samar by US escort destroyer Coolbaugh (by other version, sunk 28.10.1944 NE off Surigao Straits by US destroyers Gridley and Helm). I38 was sunk 12.11.1944 in Carolina Islands area by US destroyer Nicholas. I37 was damaged 27.4.1944 S off Penang by British mine, repair and conversion to Kaiten carrier lasted till beginning of autumn 1944, she was sunk 19.11.1944 at Palau by US escort destroyers Conklin and McCoy Reynolds. I36 was scuttled by Americans 1.4.1946.

I15 1940

 

© Ivan Gogin, 2008-14