Designed by R.M. Zhuraviev, never realized. Displacement 4,500 (surfaced)-5,400 (submerged) tons with as dimensions 121,95 (waterline)-128,0 (over all below water) x 10.36 x 9 (height hull between keel-top coning tower) x 6.55 (draft) or 400-420 x 34 x 29.5 x 21.6 feet. Skerrett mentioned a draught of 21.5 (surface trim)-29,5 (maximum submerged to top of the gun turret) feet. The propulsion consisted of 8 diesel engines supplying 18,000 hp and 8 electric motors supplying 4,400 hp via 2 shafts allowing a speed of 26 (surfaced)-14 (submerged) knots. The range was surfaced 730 nautical miles/25 knots and 1,250 nautical miles/21 knots, 18,500 nautical miles/11 knots and submerged 21 respectively 80 and 275 nautical miles with a speed of 14, respectively 10 and 6 knots. Skerrett mentioned that she could bunker more as 300 tons liquid oil making it possible of travelling from the Baltic area to the Russian North Pacific Asian naval base despite what kind of gale was blowing. Diving depth was 125 metres/410 feet. Within 3 minutes dived she from surfaced position to periscope depth for which 1,000 tons water were needed as ballast. The armament consisted of 5-12cm/4.7” quick firing guns (of which 2 in in the revolving turret forward which could be raised and lowered) to be used against torpedo vessels, 36-45.7cm/17.9” (2 bow, 2 stern, 32 amidships) torpedo tubes for which 60 Whitehead torpedoes were carried with her and finally 120 contact mines. Amidships was the conning tower which could be lowered and raised. The upper horizontal and sloping casing of the hull were protected against gunfire while diving by 5-7.5cm thick armour.
Sources
Scientific American 26 April 1913, R.G. Skerrett, Russia’s Submarine Cruiser.
Norman Polmar/Jurrien Noot. Submarines of the Russian and Soviet Navies 1718-1990
Jan Breemer. Soviet Submarines. Design, Developments and Tactics.
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