Submarine 641





    attack submarines

    General characteristics

    Length (m):


    Width (m):


    Displacement (tons):


    Speed (knots):


    Range (miles):


    Immersion depth (m):


    Draft (m):





    torpedo tubes:

    10 533 mm (22 torpedoes)

    electronic equipment

    Locator / Radar:

    "Nakata", "Flag"

    submarine 641

    The results of the CDB-18 design study in October 1954, was a joint decision of the Navy and SMEs to develop technical project "641" ocean submarine large displacement, is a further development of the project 611. In January 1955 the technical design of "641" has been developed, and in July of the same year approved by the Resolution of the USSR CM.

    In August 1955, after being started production of working drawings, it was a joint decision of the Navy and SMEs to increase the depth by applying a new vessel steel AK-25 and replacement of equipment exposed seawater pressure. Simultaneously proposed to equip submarines latest tools navigation, surveillance and communication. Furthermore, it was decided to implement a new project about 170 proposals to improve individual boat designs that take into account the experience of building and operating submarines pr.611.

    submarine 641

    Speed Boat Project 611 mode RDP was about 6 knots, which was considered insufficient. To increase the speed, it was necessary to increase the power diesels. To determine the possibility of increasing the power of diesel engines on the submarine "B-76" pr.611 (Head-№ 307) was carried out experimental verification of the engine is RDP and general shipboard systems and battery ventilation. The test showed the possibility of increasing the speed of the boat under the RDP to 10 knots and battery charging in this mode, since I stage.

    results were implemented on the submarine "641", which enabled:

    some improvement in terms of habitability of the ship. Thus, for example, have been applied the air conditioning installation such as "K-5", allowing operation in the cooling mode and heating mode, set a special device for removing waste galley (AQL), etc.

    increase in reserve funds regeneration;

    improving the conditions of service of diesel engines that operate in the DSA by the device in the diesel compartment soundproofing oiled enclosure, which housed the helm diesels;

    installation of a new sonar station "Arktika-M" instead of station "Tamir". The project also included the installation of more modern means of radio and radar;

    ability to use entered service new torpedoes "KIT" and SET, as well as torpedoes type 53-51, 53-39;

    submarine 641

    vertical and stern hydroplanes, except hydraulic and manual received emergency electric drive;

    installation instead stabilizer "Octopus" stabilizer depth "Marble", which carried out the stabilization depth as by automatic buoyancy control boats, and through automatic control hydroplanes.

    During state testing maximum surface speed was obtained by 0.28 unit and the maximum underwater - 0.5 unit above specification. Were exceeded and spvtsifikatsionnye surface cruising range. Exceeding the speed and distance of swimming explained decreasing altitude fencing cutting 800 mm compared to the technical design, high coefficient of interaction screws and housing and low specific fuel consumption compared with the calculated data.

    submarine 641

    Modernization measures taken over a number of years posovmestnym Navy and industry solutions, not only led to the complete consumption of the reserve tonnage for modernization, but also to reduce the specification values of the initial transverse stability of submerged up to 1.18 meters. A slight increase in magnitude of the initial stability gave spent on ships lowering the center of gravity of the solid ballast by transferring part of it located on the stringers of the ballast tanks, down, into the fuel tank. At the same amount of fuel decreased by 5 tons.

    A radical solution to the question of improving the stability and partial recovery of the stock on a proposal to modernize the CDB-18 in April 1964, was a joint decision, which provided for the replacement of two-stroke diesel engines to four-stroke diesel engines 37D and 2D42 battery type 46SU on an extended battery type 48cm. Engines 2D42 Kolomna plant had turbocharged, developed capacity 1,900 liters. s. At 500 rev / min and cooled fresh water. They were delivered to the ship together with a remote control system DAM-2D42 and were 8 tons lighter diesel 37D. Implementation of the proposal demanded complete reassembly of equipment and tanks V compartment as well as a partial change in the other compartments.

    submarine 641

    As a result of this work the initial metacentric height submerged boat became equal to 0.24 meters. In addition to raising prices three meta cal elevation and partial recovery of the stock for the modernization, replacement of diesel engines has reduced air noise in the V compartment, which in combination with the remote control has significantly improved the habitability of this chamber, and due to the lower specific fuel consumption of new diesel engines compared to diesels 37D increased cruising range diesel engines under all operating conditions.

    In 1965, at the request of India, the USSR agreed to sell its submarines pr.641. While the Indian side requested a retrofit boats some devices that take into account the specific conditions of use of submarines in the southern latitudes. After reaching an appropriate agreement in October 1965 CDB-18 began to develop technical project I641 submarines for India based pr.641. The hardware and armament project I641, basically remained the same as in pr.641 except the battery (left 46SU) and some electronic equipment. In addition, by eliminating the two cabins in the IV compartment was posted installation of air conditioning type SPHM-FU-90, well justified itself on other submarines. Increased its stock of fresh water. All equipment is produced in tropical export performance, etc. In the future submarine I641 are proven in operation in the southern latitudes.

    submarine 641


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