NAVYPEDIA

Photo

Pochtovyy 1908    

Ships

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

Technical data

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

Standard scale images

Graphics

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.