![]() And unlike the American practice, in which hull numbers are generally assigned in a consecutive numerical sequence which corresponds to the chronological sequence of construction, the pennant numbers assigned Russian submarines do not conform to an apparent set pattern. The Oscars are rather poorly characterized in the open literature, with substantial discrepancies in reported submerged displacement and maximum submerged speed. The Oscar II is also characterized by a substantially enlarged fin, which should improve underwater manueverability, as well as the substitution of the Oscar-I's four-bladed propeller with a quiter seven-blade propeller. ![]() ![]() The improved Oscar II is about 10 meters longer than the Oscar I, possibly making room for a quieter propulsion system, and feature upgraded electronic systems. These large submarines are said to be slow to dive and maneuver, though they are credited with a submerged speed of about 30 knots - sufficient to keep pace with their targets. The 3.5 meter separation between the inner and outter hulls on the Oscar provides significant reserve buoyancy, and improved survivability against conventional torpedoes. American submarines have a single pressure hull, with additional hydrodynamic fairings, such as the cap that encloses the bow sonar dome. As with earlier cruise-missile submarine, the Oscar was designed primarily to attack American aircraft carrier battle groups.Īs with other Russian submarines, the Oscar features a double hull - and inner pressure hull and an outer hydrodynamic hull, with eight inches of rubber between them to muffle sounds. The Oscar-class nuclear-powered cruise missile attack submarine, which displaces more than 18,000 tons when under water, is one of Russia's largest and most capable submarines.
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