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Russian Tango-class submarines (Project 641B Som [Catfish]) were the successors to the Foxtrot-class submarine based in the Black Sea and Northern Fleet areas. The first of the class was completed in 1972 at Gorky. A total of 18 were built in two slightly different versions. The later type was several metres longer than the first possibly because of installation of ASW missile equipment.
The bow sonar installations appear to be similar to those fitted into Soviet nuclear attack submarines. The propulsion plant was the same as the last subgroup of the Foxtrot-class submarine. The Tango class had far more battery capacity, far higher than previous conventional submarine class in the Soviet Navy. As a result, pressure hull volume increased. This allowed an underwater endurance in excess of a week before snorkeling was required.
Coupled with new armament and sensor fit, the Tango class were ideal for ambush operations against Western nuclear submarines at natural chokepoints.
Because of its all-hull rubber coating, the sub class was nicknamed "rezinka" [rubber][citation needed]
Construction of this class has now stopped. One unit remains in the Black Sea Fleet but it may have been decommissioned since 2010
Подводные лодки проекта 641Б - серия советских дизель-электрических подводных лодок (Tango по классификации НАТО). Является модернизацией проекта 641. По конструкции лодка выполнена двухкорпусной, имеет семь отсеков: первый - (носовой) торпедный; второй и четвёртый - носовой и кормовой аккумуляторные; третий - центральный пост; пятый - дизельный; шестой - электромоторный; седьмой - агрегатный и жилой. Первый, третий и седьмой отсеки приспособлены для эвакуации экипажа.
Проект 641Б спроектирован в ЦКБ МТ «Рубин». Главный конструкор З.А. Дерибин, с 1974 Кормилицин Ю.Н. С 1973 по 1982 год на судостроительном заводе «Красное Сормово» (Нижний Новгород) было построено 18 подводных лодок этого проекта.
Негізгі бет Moscow. Museum Submarine Project 641B "Catfish" 396 b.
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