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| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
|---|---|---|---|---|---|---|---|
| S66, 9.1914- T66 | 499 | Schichau, Elbing | 1892 | 27.4.1893 | 7/1893 | minesweeper 1914, sunk 18.10.1917 |
| Displacement normal, t | 140 |
|---|---|
| Displacement full, t | 172 |
| Length, m | 47.9 |
| Breadth, m | 5.42 |
| Draught, m | 2.74 deep load |
| No of shafts | 1 |
| Machinery | 1 VTE, 2 locomotive boilers |
| Power, h. p. | 1610 |
| Max speed, kts | 22.1 |
| Fuel, t | coal 36 |
| Endurance, nm(kts) | 1560(14) |
| Armament | 1 x 1 - 50/37 SK L/40 C/92, 1 - 450 TT (bow), 2 x 1 - 450 TT |
| Complement | 22 - 24 |
These vessels continued the same process of steady improvement of the basic design begun by their predecessors.
1902: was reboilered with 1 locomotive boiler
1914: - 1 - 450 TT, 2 x 1 - 450 TT; + mechanical minesweeping gear
Most were rebuilt and reboilered in the opening years of the new century. In September 1914 all were redesignated with the letter T beginning their numbers, and were used during the war as minesweepers and as tenders to instructional vessels. T66 was mined in Gulf of Riga 18.10.1917.

