The Chief Command of the Russian Navy decided to build a sonar patrol submarine. The new submarine will get systems that will allow detecting submarines and surface ships as well as low-flying targets at a distance up to 600 km in the passive mode. At a distance up to 100 km a ship will be able to determine the type of targets, as reports i-mash. Subsurface analogue of the airborne warning and control system (AWACS) is officially called "sonar patrol and situational awareness submarine". Unlike the aircraft, it operates in the passive mode, i.e. only considers hydrologic situation, without transmitting active signals and remaining invisible to the enemy.
Gorky Zelenodolsk Plant delivered the Almetyevsk lead ship (type RST25). Customer of two river-sea tankers is Nafta-Invest Company. Financing is carried out by Ak Bars Leasing. The designer is the Marine Engineering Bureau. The ship is of Russian River Registry class M-SP 4.5 (ice 40) A ECOZ, which means "combined river-sea going, capable of moving in ice 40 cm thick and at wave height 4.5 m").
Specifications:
LOA: 139.99 m
Beam: 16.6 m
Depth: 5.5 m
Capacity of 6 cargo tanks and 2 slop tanks: 6 990 cub. m
Sea deadweight: about 6 610 tons, draught: 4.17 m
River deadweight: about 5 130 tons, draught: 3.60 m
Operating speed: 10.5 kt
Endurance: 20 days
Crew: 12 in number (14 accommodations).
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