U23 1915
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| U23 | 177 | Germaniawerft, Kiel | 1911 | 12.4.1913 | 9.1913 | sunk 20.7.1915 | |
| U24 | 178 | Germaniawerft, Kiel | 1911 | 24.5.1913 | 12.1913 | to United Kingdom 11.1918 | |
| U25 | 179 | Germaniawerft, Kiel | 1911 | 12.7.1913 | 5.1914 | to France 2.1919 | |
| U26 | 180 | Germaniawerft, Kiel | 1911 | 16.10.1913 | 5.1914 | sunk 9.1915 |
|
Displacement standard, t |
|
|
Displacement normal, t |
669 / 864 |
|
Length, m |
64.7 |
|
Breadth, m |
6.32 |
|
Draught, m |
3.45 |
|
No of shafts |
2 |
|
Machinery |
2 Germania diesels / 2 SSW electric motors |
|
Power, h. p. |
1800 / 1200 |
|
Max speed, kts |
16.7 / 10.3 |
|
Fuel, t |
diesel oil 85 |
| Endurance, nm(kts) | 7620(8) / 85(5) |
|
Armament |
1 x 1 - 7.9/79, 4 - 500 TT (2 bow, 2 stern, 6) |
|
Complement |
35 |
| Diving depth operational, m | 50 |
Project history: Medium coastal submarines. Double-hulled.
Modernizations: 10.1914, U25, 1915, U23, 24, 26: - 1 x 1 - 7.9/79; + 1 x 1 - 88/27 TK L/30 C/08
1916, U25: + 1 x 1 - 88/27 TK L/30 C/08
1917, U25: - 1 x 1 - 88/27
late 1918, U24, 25: - 1 x 1 - 88/27; + 1 x 1 - 105/43 TK L/45 C/16
Naval service: U23 was sunk by British submarine C27 and decoy ship Princess Marie José 20.7.1915 in the North Sea. U26 was lost on mines in early September, 1915 in the Baltic Sea.
U24 1914
© Ivan Gogin, 2014