I35 1942
I35 1943
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| 伊15 [I15] | Kure K K | 1/1938 | 7.3.1939 | 9.1940 | sunk 10.11.1942 | ||
| 伊17 [I17] | Yokosuka K K | 4/1938 | 19.7.1939 | 1.1941 | sunk 19.8.1943 | ||
| 伊19 [I19] | Mitsubishi, Kobe | 3/1938 | 16.9.1939 | 4.1941 | sunk 25.11.1943 | ||
| 伊21 [I21] | Kawasaki, Kobe | 1/1939 | 24.2.1940 | 7.1941 | sunk 29.11.1943 | ||
| 伊23 [I23] | Yokosuka K K | 1/1939 | 24.11.1939 | 9.1941 | sunk 18.2.1942 | ||
| 伊25 [I25] | Mitsubishi, Kobe | 2/1939 | 8.6.1940 | 10.1941 | sunk 3.9.1943 | ||
| 伊26 [I26] | Kure K K | 7/1939 | 10.4.1940 | 11.1941 | sunk 24.10.1944 | ||
| 伊27 [I27] | Sasebo K K | 7/1939 | 6.6.1940 | 2.1942 | sunk 12.2.1944 | ||
| 伊28 [I28] | Mitsubishi, Kobe | 9/1939 | 18.12.1940 | 2.1942 | sunk 17.5.1942 | ||
| 伊29 [I29] | Yokosuka K K | 9/1939 | 29.9.1940 | 2.1942 | sunk 26.7.1944 | ||
| 伊30 [I30] | Kure K K | 6/1939 | 17.9.1940 | 2.1942 | sunk 13.10.1942 | ||
| 伊31 [I31] | Yokosuka K K | 12/1939 | 13.3.1941 | 5.1942 | sunk 13.6.1943 | ||
| 伊32 [I32] | Sasebo K K | 1/1940 | 17.12.1940 | 4.1942 | sunk 24.3.1944 | ||
| 伊33 [I33] | Mitsubishi, Kobe | 2/1940 | 1.5.1941 | 6.1942 | wrecked 13.6.1944 | ||
| 伊34 [I34] | Sasebo K K | 1/1941 | 24.9.1941 | 8.1942 | sunk 13.11.1943 | ||
| 伊35 [I35] | Mitsubishi, Kobe | 9/1940 | 24.9.1941 | 8.1942 | sunk 22.11.1943 | ||
| 伊36 [I36] | Yokosuka K K | 12/1940 | 1.11.1941 | 9.1942 | surrendered 8.1945, scuttled 1.4.1946 | ||
| 伊37 [I37] | Kure K K | 12/1940 | 22.10.1941 | 3.1943 | sunk 19.11.1944 | ||
| 伊38 [I38] | Sasebo K K | 6/1941 | 15.4.1942 | 1.1943 | sunk 12.11.1944 | ||
| 伊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