Military Wiki
Losos-class submarine
Lsos class submarine
Class overview
Builders: Shipyard "Leningradskoe Admiralteyskoe Obedinenie" (Admiralteyskie Verfi), Saint Petersburg (Leningrad)
Operators:  Soviet Navy
 Russian Navy
In service: 1988-1997
Planned: 6
Completed: 2
Cancelled: 4
Active: 0
Laid up: 2
General characteristics
Displacement: 218 tons surfaced, 390 tons submerged
Length: 28.2 meters long
Beam: 4.8 meters beam
Draught: 5.1 meters draft
Depth of hold: Operational: 240 meters
Maximum: 300 meters
Installed power: Diesel-electric
Propulsion: diesel electric, 2 diesel – 160kW; propulsion motor – 60kW
Speed: 6.65 knots (12.32 km/h; 7.65 mph) (dived)
6.43 knots (11.91 km/h; 7.40 mph) (surfaced)
Endurance: 10 days
Test depth: 200 m
Crew: 9
Electronic warfare
& decoys:
Active/passive radar and sonar
Armament: 2 mine-laying devices or 2 torpedoes

Project 865 Piranha (Russian: Проект 865 «Пиранья») is a type of Russian (formerly Soviet) midget submarine. The NATO reporting name for the class is Losos, which means "salmon" in the Russian language.

The Losos was designed for special operations and engaging surface ships located offshore, and is thus very durable and almost completely silent.[citation needed]

The hull is made of a titanium alloy, which helps with signature management because it is not magnetic. The non-magnetic alloy would greatly reduce the effectiveness of enemy magnetic anomaly detectors or magnetic limpet mines against this type of vessel.

Only two Losos class submarines were built: the MS-520 and the MS-521. Original planning called for a total of 12 Project 865 Piranya submarines to be constructed; this was eventually reduced to 6, then just the two. Launched in 1986 and 1990, respectively, they are in reserve but are expected to soon be discarded.


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