| Displacement | 735t surface, 1030t submerged |
|---|---|
| Length | 69.2m oa |
| Width | 6.4m |
| Draught | 3.4m |
| Machinery | 2-shaft diesel/electric motor, 2600bhp surface, 1200shp submerged |
| Fuel | oil 60t |
| Speed | 18kt surface, 9kt submerged |
| Range | 4000nm by 10kt surface, 85nm by 4kt submerged |
| Armament | 6-45cm TT, 1-8cm/28cal AA gun |
| Complement | 44 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| Ro-11 iSS-19j | FY1916 | Kure NYd | 1917. 4.25 | 1917.10.15 | 1919. 7.31 | SS2 (SS-19) | 1924.11. 1 renamed(Ro-11) 1932. 4. 1 disc |
| Ro-12 iSS-20j | FY1916 | Kure NYd | 1917. 4.25 | 1917.12. 1 | 1919. 9.18 | SS2 (SS-20) | 1924.11. 1 renamed(Ro-12) 1932. 4. 1 disc |