U9 1914
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| U9 | 4 | KW Danzig | 1908 | 22.2.1910 | 4.1910 | to United Kingdom 11.1918 | |
| U10 | 5 | KW Danzig | 1908 | 24.1.1911 | 8.1911 | lost 27.5.1916 | |
| U11 | 6 | KW Danzig | 1908 | 2.4.1910 | 9.1910 | sunk 9.12.1914 | |
| U12 | 7 | KW Danzig | 1908 | 6.5.1910 | 8.1911 | sunk 10.3.1915 |
|
Displacement standard, t |
|
|
Displacement normal, t |
493 / 611 |
|
Length, m |
57.4 |
|
Breadth, m |
6.00 |
|
Draught, m |
3.13 |
|
No of shafts |
2 |
|
Machinery |
4 Körting petrol engines / 2 SSW electric motors |
|
Power, h. p. |
1000 / 1160 |
|
Max speed, kts |
14.2 / 8.1 |
|
Fuel, t |
petrol 52 |
| Endurance, nm(kts) | 1800(14) / 80(5) |
|
Armament |
1 x 1 - 7.9/79, 4 - 450 TT (2 bow, 2 stern, 6) |
|
Complement |
29 |
| Diving depth operational, m | 50 |
Project history: Medium coastal submarines. Double-hulled.
Modernizations: by late 1914, U9, 10, 12: - 1 x 1 - 7.9/79; + 1 x 5 - 37/27 RV L/30
1915, U9, 10: + 1 x 1 - 50/37 SK L/40 C/92
late 1915, U9: - 1 x 5 - 37/17
late 1915, U10: - 1 x 1 - 50/37, 1 x 5 - 37/17; + 1 x 1 - 88/42 TK L/45 C/14
3/1916, U9: - 1 x 1 - 50/37; + 12 mines
12/1916, U9: - 12 mines; + 1 x 1 - 50/37 SK L/40 C/92
Naval service: U10 was lost by unknown cause after 27.5.1916 in the Baltic Sea, probably mined. U11 was mined in English Channel 9.12.1914. U12 was rammed and sunk by explosive paravans of British destroyer Ariel in the North Sea 10.3.1915.
© Ivan Gogin, 2014