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| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
|---|---|---|---|---|---|---|---|
| 第8号艦 [8-go], 11.1924- 波1 [HA1] | 366 | Vickers, Barrow, UK | 8.1907 | 19.5.1908 | 2.1909 | stricken 12.1928 | |
| 第9号艦 [9-go], 11.1924- 波2 [HA2] | 367 | Vickers, Barrow, UK | 8.1907 | 19.5.1908 | 3.1909 | stricken 12.1928 |
| Displacement standard, t |
|
|---|---|
| Displacement normal, t | 286 / 321 |
| Length, m | 40.1 pp 43.3 oa |
| Breadth, m | 4.10 |
| Draught, m | 3.40 |
| No of shafts | 1 |
| Machinery | 1 16-cyl Vickers petrol engine / 1 electric motor |
| Power, h. p. | 600 / 300 |
| Max speed, kts | 12 / 8.5 |
| Fuel, t | petrol 15 |
| Endurance, nm(kts) | 660(12) / 60(4) |
| Armament | 2 - 450 TT (bow, 2), 1 x 1 - 6.5/115 |
| Complement | 26 |
| Diving depth operational, m | 30 |
Copy of RN "C" class submarines. Single-hulled, ordered under the 1907 programme. Japanese did not have experience of designing of modern submarines, and it was necessary to be content with already hopelessly out-of-date design.
None.
No significant events.
Many thanks to Wolfgang Stöhr for additional information on this page.

