Russian submarine Pochtovy

History
Russian Empire
Name:	Pochtovy
Builder:	Metal works in St Petersburg, Baltic Sea
Launched:	1908
Decommissioned:	1913
General characteristics
Displacement:	134 tons surfaced; 146 tons submerged;
Length:	34.4 m
Beam:	3.0 m
Draft:	2.8 m
Propulsion:	2 petrol engines 260 hp (190 kW) combined
Speed:	10.5 knots (19.4 km/h; 12.1 mph) surfaced; 6.2 knots (11 km/h; 7 mph) submerged;
Range:	350 nautical miles (650 km)
Complement:	11
Armament:	4 torpedo drop collars

Pochtovy (Russian: Почтовый) was a submarine built for the Imperial Russian Navy. The boat was designed by Drzewiecki and built at the Metal Works St Petersburg in 1908. She was funded by Public subscription.[1]

This ship's machinery was a novel attempt at Air Independent Propulsion (AIP) using gasoline engines with air supplied by pressurised cylinders. Forty-five cylinders containing 350 cubic feet (9.9 m³) of air at 2500 psi could give the boat a 28-nautical-mile (52 km) submerged range on one engine. The exhaust gases were vented via perforated pipe under the keel. The system proved reliable in trials but condensation problems and the tell-tale wake produced by the exhaust resulted in no further development and the boat was stricken in 1913.[1]

References

Gardiner, Robert; Gray, Randal; Budzbon, Przemyslaw (May 1985). Conway's All the World's Fighting Ships, 1906–1921. Naval Institute Press. pp. 314–15. ISBN 978-0-87021-907-8. Retrieved 28 June 2010.

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[GardinerGray1985-1] Gardiner, Robert; Gray, Randal; Budzbon, Przemyslaw (May 1985). Conway's All the World's Fighting Ships, 1906–1921. Naval Institute Press. pp. 314–15. ISBN 978-0-87021-907-8. Retrieved 28 June 2010.