''Pochtovy'' (russian: Почтовый) was a submarine built for the

Imperial Russian Navy The Imperial Russian Navy () operated as the navy of the Russian Tsardom and later the Russian Empire from 1696 to 1917. Formally established in 1696, it lasted until dissolved in the wake of the February Revolution of 1917. It developed from a ...

. The boat was designed by Drzewiecki and built at the Metal Works St Petersburg in 1908. She was funded by Public subscription. This ship's machinery was a novel attempt at

Air Independent Propulsion Air-independent propulsion (AIP), or air-independent power, is any marine propulsion technology that allows a non-nuclear submarine to operate without access to atmospheric oxygen (by surfacing or using a snorkel). AIP can augment or replace the ...

(AIP) using gasoline engines with air supplied by pressurised cylinders. Forty-five cylinders containing of air at 2500 psi could give the boat a 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.

References

{{DEFAULTSORT:Pochtovy Submarines of the Imperial Russian Navy Ships built in Russia 1908 ships Experimental submarines