RO30 1943
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| 第68号艦 [68-go], 11.1924- 呂29 [RO29] | Kawasaki, Kobe | 6.1921 | 5.12.1922 | 9.1923 | sold 4.1936 | ||
| 第69号艦 [69-go], 11.1924- 呂30 [RO30] | Kawasaki, Kobe | 8.1921 | 18.1.1923 | 4.1924 | stricken 4.1942 | ||
| 第70号艦 [70-go] | Kawasaki, Kobe | 8.1922 | 2/1923 | --- | sunk in trials 21.8.1923 | ||
| 呂31 [RO31] | Kawasaki, Kobe | 12.1924 | 25.9.1926 | 5.1927 | stricken 5.1945 | ||
| 第71号艦 [71-go], 11.1924- 呂32 [RO32] | Kawasaki, Kobe | 9.1921 | 19.3.1923 | 5.1924 | stricken 4.1942 |
|
Displacement standard, t |
|
|
Displacement normal, t |
665 / 1030 |
|
Length, m |
74.2 |
|
Breadth, m |
6.10 |
|
Draught, m |
3.70 |
|
No of shafts |
2 |
|
Machinery |
2 FIAT diesels / 2 electric motors |
|
Power, h. p. |
1200 / 1200 |
|
Max speed, kts |
13 / 8 |
|
Fuel, t |
diesel oil 113 - 116 |
| Endurance, nm(kts) | 8000(10) / 85(4) |
| Armament |
1 x 1 - 120/45 11-shiki, 1 x 1 - 7.7/87, 4 - 533 TT (bow, 8) |
|
Complement |
43 |
|
Diving depth operational, m |
75 |
Project history: Kai-Toku-Chu (Medium special Admiralty) type. Built under the 1918 programme, developed on the basis of the Schneider-Laubeuf design. Nos72-87 were cancelled under terms of Washington Treaty.
Modernizations: none
Naval service: 70-go during commissioning trials 21.8.1923 foundered in Kobe harbour as result of technical accident, salvaged in November, 1924. She was officially repaired and completed in 1927 but as fact new submarine was built.
RO30-32 were laid up 1.4.1942, till the end of war they were used as training hulks. RO31 was scuttled by Americans 5.4.1946.
RO31
© Ivan Gogin, 2008-14