U3 1912
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| U3 | 2 | KW Danzig | 1907 | 27.3.1909 | 5.1909 | to United Kingdom 1.12.1918 | |
| U4 | 3 | KW Danzig | 1907 | 18.5.1909 | 7.1909 | discarded 1.1919 |
|
Displacement standard, t |
|
|
Displacement normal, t |
421 / 510 |
|
Length, m |
51.3 |
|
Breadth, m |
5.60 |
|
Draught, m |
3.05 |
|
No of shafts |
2 |
|
Machinery |
2 Körting petrol engines / 2 SSW electric motors |
|
Power, h. p. |
600 / 1030 |
|
Max speed, kts |
11.8 / 9.4 |
|
Fuel, t |
petrol 48 |
| Endurance, nm(kts) | 1800(12) / 55(4.5) |
|
Armament |
1 x 1 - 7.9/79, 4 - 450 TT (2 bow, 2 stern, 6) |
|
Complement |
22 |
| Diving depth operational, m | 30 |
Project history: Known as Project 12 these two boats were built at Danzig N Yd. Double-hulled.
Modernizations: by late 1914, both: - 1 x 1 - 7.9/79; + 1 x 5 - 37/27 RV L/30
1915, both: - 1 x 5 - 37/17; + 1 x 1 - 50/37 SK L/40 C/92
Naval service: U3 served for trials, was raised after a diving accident 17.11.1911 and sunk during the transfer tow to England in 1918. U4 was broken up after the war.
© Ivan Gogin, 2014