- Russian submarine Pochtovy
The "Pochtovy" (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.This ship's machinery was a novel attempt at
Air Independent Propulsion (AIP) using gasoline engines with oxygen supplied by pressurised cylinders. Forty-five cylinders containing 350 cubic feet of air at 2500 psi could give the boat a 28 nautical mile submerged range. The exhaust gasses were vented via perforated pipe under the keel. The system proved reliable in trials but condensation problems and the tale-tale wake produced by the exhaust resulted in no further development and the boat was stricken in 1913.References
* Conway's "All the World's Fighting Ships 1906-1921"
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