I68 1941
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| 伊68 [I68], 5.1942- 伊168 [I168] | Kure K K | 6/1931 | 26.6.1933 | 7/1934 | sunk 27.7.1943 | ||
| 伊69 [I69], 5.1942- 伊169 [I169] | Mitsubishi, Kobe | 12/1931 | 15.2.1934 | 9/1935 | sunk 4.4.1944 | ||
| 伊70 [I70] | Sasebo K K | 1/1933 | 14.6.1934 | 11/1935 | sunk 10.12.1941 | ||
| 伊71 [I71], 5.1942- 伊171 [I171] | Kawasaki, Kobe | 2/1933 | 25.8.1934 | 12/1935 | sunk 1.2.1944 | ||
| 伊72 [I72], 5.1942- 伊172 [I172] | Mitsubishi, Kobe | 12/1933 | 20.6.1935 | 1/1937 | sunk 10.11.1942 | ||
| 伊73 [I73] | Kawasaki, Kobe | 4/1934 | 20.6.1935 | 1/1937 | sunk 27.1.1942 |
|
Displacement standard, t |
1400 |
|
Displacement normal, t |
1785 / 2440 |
|
Length, m |
98.4 pp 102.6 wl 104.7 oa |
|
Breadth, m |
8.20 |
|
Draught, m |
4.58 |
|
No of shafts |
2 |
|
Machinery |
2 Kampon diesels / 2 electric motors |
|
Power, h. p. |
9000 / 1800 |
|
Max speed, kts |
23 / 8.2 |
|
Fuel, t |
diesel oil 230 |
| Endurance, nm(kts) | 14000(10) / 65(3) |
| Armament |
I68 - 70: 1 x 1 - 100/50 88-shiki, 1 x 1 - 13.2/76, 6 - 533 TT (4 bow, 2 stern, 14) I71 - 73: 1 x 1 - 120/45 11-shiki, 1 x 1 - 13.2/76, 6 - 533 TT (4 bow, 2 stern, 14) |
| Electronic equipment | 91-shiki sonar, MV-shiki hydrophone |
|
Complement |
60 - 84 |
|
Diving depth operational, m |
I68, 69: 70 I70 - 73: 75 |
Project history: Kaidai 6a (Large Admiralty 6a) type. Built under 1st Supplementary programme of of 1931. Further development of Kaidai 5 type, differed in one and a half time of more powerful diesels and raised speed. Double-hulled, endurance was about 45 days.
I172 was also supposed to convert in late 1942 to transport, however it is not known, whether it has been made before her loss.
Modernizations: Autumn 1942, I171: was converted to transport submarine; - 1 x 1 - 120/45, torpedoes stowage was decreased; + 1 14m Daihatsu-type landing craft, deck cargo
Naval service: I70 was sunk 10.12.1941 NE off Oahu by US carrier aircraft. I73 was sunk 27.1.1942 W off Midway by US submarine Gudgeon. I172 was sunk 10.11.1942 at Guadalcanal by US destroyer Southard. I168 presumably was sunk 27.7.1943 at New Hanover by US submarine Scamp. I171 was sunk 1.2.1944 at Buka Island by US destroyers Guest and Hudson. I169 was sunk 4.4.1944 at Truk by US aircraft.
I68
© Ivan Gogin, 2008-14