Pochtovy 1909
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| Почтовый [Pochtovyy] | Metal Wks, St. Petersburg | Spring 1906 | 10/1906 | 10/1908 | stricken 8.1913 |
|
Displacement standard, t |
|
|
Displacement normal, t |
134 / 146 - 149 |
|
Length, m |
36.0 |
|
Breadth, m |
3.20 |
|
Draught, m |
2.70 |
|
No of shafts |
1 |
|
Machinery |
2 petrol engines / 1 petrol engine |
|
Power, h. p. |
260 / 130 |
|
Max speed, kts |
11.6 / 6.2 |
|
Fuel, t |
petrol |
| Endurance, nm(kts) | 530(6.2) / 27(6.2) |
|
Armament |
4 - 450 TC (ext cradles) |
|
Complement |
11 |
| Diving depth operational, m |
30 max |
Project history: Drzewiecki design, construction funded by public subscription between workers of Russian mail service, so the submarine was named Pochtovyy [Mail]. The chief aim of the design was to provide a submarine with a single diesel propulsion when surfaced and submerged. Because of the lack of a suitable diesel engine in 1905 gasoline ones were fitted instead. These were supplied with oxygen from 45 air cylinders (10m3 of air under 500kgf/cm2 was carried) when submerged. Exhaust gases were ejected overboard by compressor jointed to a perforated pipe under the keel. With only 1 engine running she was able to cover 28 miles when submerged and 350 miles on two another engines when on the surface. The whole system proved reliable enough but further refinement was abandoned because of steam collecting inside the hull when the boat was submerged and the bubble wake on the surface.
Modernizations: 1910s: - 2 - 450 TC
Naval service: No significant events.
Pochtovyy 1908
© Ivan Gogin, 2014