O9 1940
| Name | No | Builder | Laid down | Launched | Comp | Fate |
| O9 | De Schelde, Vlissingen | 9/1922 | 7/4/1925 | 1/1926 | stricken 12/1944 | |
| O10 | De Schelde, Vlissingen | 12/1923 | 30/7/1925 | 9/1926 | stricken 10/1944 | |
| O11 | De Schelde, Vlissingen | 12/1922 | 19/3/1925 | 1/1926 | scuttled 14/5/1940 |
|
Displacement standard, t |
483 |
|
Displacement normal, t |
526 / 656 |
|
Length, m |
54.7 |
|
Breadth, m |
5.70 |
|
Draught, m |
3.53 |
|
No of shafts |
2 |
|
Machinery |
Sulzer 6-cyl diesels / electric motors |
|
Power, h. p. |
900 / 500 |
|
Max speed, kts |
12 / 8 |
|
Fuel, t |
diesel oil |
|
Endurance, nm(kts) |
3500(8) / 25(8) |
|
Armament |
1 x 1 - 88/45 Bofors No.2, 2 - 533 TT (bow, 4), 3 - 450 TT (2 bow, 1 stern , 6) |
|
Complement |
29 |
| Diving depth operational, m | 60 |
Ship project history: Built under the 1917 program. Smallest version of K XI class. Double-hulled, equipped by hydraulically-driven periscopes. The first twin-shaft submarines for actions in mother country waters. First Dutch submarines with a central operation by all ballast tank valves.
Modernizations: late 1920s, all: + 1 x 1 - 12.7/90
Naval service: O9 and O10 in May, 1940 escaped to Britain; they were stricken in 1944, and BU in October, 1946. O11 was scuttled at Den Helder 14/5/1940, she was salvaged by Germans, but not commissioned and again scuttled in September, 1944; she was salvaged second time 10/12/1947 and broken up.
O9
© Ivan Gogin, 2011