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| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
|---|---|---|---|---|---|---|---|
| U17 | 11 | KW Danzig | 1910 | 16.4.1912 | 11.1912 | discarded 1.1919 | |
| U18 | 12 | KW Danzig | 1910 | 25.4.1912 | 11.1912 | sunk 23.11.1914 |
| Displacement standard, t |
|
|---|---|
| Displacement normal, t | 564 / 691 |
| Length, m | 62.4 |
| Breadth, m | 6.00 |
| Draught, m | 3.40 |
| No of shafts | 2 |
| Machinery | 4 Körting petrol engines / 2 AEG electric motors |
| Power, h. p. | 1400 / 1120 |
| Max speed, kts | 14.9 / 9.5 |
| Fuel, t | petrol 74 |
| Endurance, nm(kts) | 6700(8) / 75(5) |
| Armament | 1 x 1 - 7.9/79, 4 - 450 TT (2 bow, 2 stern, 6) |
| Complement | 29 |
| Diving depth operational, m | 50 |
Medium coastal submarines. Double-hulled.
late 1914, U17: - 1 x 1 - 7.9/79; + 1 x 5 - 37/27 RV L/30
1915, U17: + 1 x 1 - 50/37 SK L/40 C/92
1917, U17: - 1 x 5 - 37/17
U18 received underwater damage of the rudder, had to be surfaced and was sunk by British coastal artillery off Scapa Flow (Orkney Islands) 23.11.1914.

