| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| Ç.1 [Z.1] | Baltic Wks, St. Petersburg | 1917 | --- | --- | suspended 1918 | ||
| Ç.2 [Z.2] | Baltic Wks, St. Petersburg | 1917 | --- | --- | suspended 1918 | ||
| Ç.3 [Z.3] | Russo-Baltic Wks, Revel | 1917 | --- | --- | suspended 1918 | ||
| Ç.4 [Z.4] | Russo-Baltic Wks, Revel | 1917 | --- | --- | suspended 1918 |
|
Displacement standard, t |
|
|
Displacement normal, t |
Z.1, 2: 230 / 275 Z.3, 4: 229 / 264 |
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Length, m |
|
|
Breadth, m |
|
|
Draught, m |
|
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No of shafts |
2 |
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Machinery |
2 diesels / 2 electric motors |
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Power, h. p. |
|
|
Max speed, kts |
10 / 5 |
|
Fuel, t |
diesel oil |
| Endurance, nm(kts) | 2000 / 90 |
|
Armament |
Z.1, 2: 20 mines Z.3, 4: 16 mines |
|
Complement |
50 |
| Diving depth operational, m | 45 |
Project history: Part of the 1916 Submarine Programme, designated for the Baltic Fleet. Ordered 1917 but construction abandoned after the Bolshevik Revolution.
© Ivan Gogin, 2014