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| Project 667BDRM | |
|---|---|
| Name | Project 667BDRM |
| Other names | Delta IV class |
| Type | Ballistic missile submarine |
| Builder | Sevmash |
| Operator | Soviet Navy; Russian Navy |
| First of class | K-51 |
| In service | 1985 |
| Displacement | 18,200 tonnes (surfaced) / 24,000 tonnes (submerged) |
| Length | 167.4 m |
| Beam | 11.7 m |
| Complement | ~135 |
| Armament | 16 × R-29RM (SS-N-23 'Skiff') SLBMs; torpedoes |
| Propulsion | 1 × pressurized water reactor; steam turbines; 2 shafts |
Project 667BDRM is the Soviet designation for the submarine class commonly known in the West as the Delta IV class. Developed during the Cold War, the class served as a strategic component of the Soviet Navy nuclear deterrent and continued service with the Russian Navy into the 21st century. The design emphasized endurance, survivability, and the ability to launch multiple submarine-launched ballistic missiles while submerged.
The class was conceived under the strategic priorities set by leaders such as Leonid Brezhnev, guided by directives from the Council of Ministers of the Soviet Union and naval planners in Leningrad at yards like Sevmash. Influences included earlier Soviet designs such as Project 667BDR (Delta III), lessons from Project 941 Akula (Typhoon class), and technological exchanges within institutes like the Malakhit Central Design Bureau and Rubin Design Bureau. Requirements reflected arms-control contexts shaped by negotiations including the Strategic Arms Limitation Talks and the later Strategic Arms Reduction Treaty framework. Construction techniques and reactor technology drew on Soviet shipbuilding traditions established at Northern Machine-Building Enterprise (Sevmash) and industrial support from ship-repair bases at Murmansk and Sevastopol.
The hull and acoustic treatment incorporated developments from naval architecture groups in St. Petersburg and Moscow, while sonar suites were products of enterprises linked to Kursk-era research centers. The submarines were powered by a pressurized water reactor feeding steam turbines, a propulsion approach shared in lineage with designs overseen by engineers associated with Kurchatov Institute research and navy propulsion bureaus formerly attached to Myasishchev projects. Armament centered on 16 R-29RM SLBMs (NATO reporting name SS-N-23 'Skiff'), deploying multiple independently targetable reentry vehicles, developed by design bureaus such as MKB Raduga and tested at ranges overseen by facilities in Plesetsk and Kamchatka. Fire-control, navigation, and electronic suites integrated technologies from institutes in Nizhny Novgorod and Kaliningrad, and telecommunications linked to the Main Naval Staff command chains and strategic command nodes.
Units entered service in the mid-1980s, taking patrol stations across bastions monitored by facilities in Severomorsk and transit routes past chokepoints like the Barents Sea and the Norwegian Sea. Deployments intersected with naval diplomacy involving fleets at ports such as Vladivostok and exchanges with officers trained at academies like the N. G. Kuznetsov Naval Academy. The class operated through transitional periods including the dissolution of the Soviet Union and asset transfers under administrations led by figures including Mikhail Gorbachev and Boris Yeltsin. Command-and-control practices adapted to treaties and verification regimes formulated at summits involving leaders like Ronald Reagan and George H. W. Bush.
The platform spawned incremental updates produced by bureaus and yards in Leningrad and Sevmash, reflecting equipment fits from enterprises in Chelyabinsk and Kazan. Later modernizations paralleled retrofit programs that also affected contemporaries such as Akula-class submarines and designs from Rubin Design Bureau, incorporating upgraded electronics, life-support, and missile-system improvements corresponding to follow-on SLBM developments conceptualized by teams associated with Makeyev Design Bureau.
Noteworthy events involved incidents during exercises and at repair yards tied to naval infrastructure in Severodvinsk and Polyarny. Investigations engaged agencies linked to ministries historically overseen by officials in Kremlin security circles and commissions chaired by personnel with service in fleets based at Sevastopol or training at the Higher Naval School. Some accidents informed safety protocols adopted across submarine fleets including those at Gadzhievo and in regions proximate to Kola Peninsula facilities.
Although primarily retained by the Soviet Navy and later the Russian Navy, the class attracted attention from navies and analysts in capitals such as Washington, D.C., London, Paris, and Beijing. Intelligence assessments produced by organizations like the Central Intelligence Agency and the Ministry of Defence (United Kingdom) evaluated capabilities, while arms-control experts from institutes in Geneva and Vienna monitored treaty implications. Technical observers from navies including the People's Liberation Army Navy and the Indian Navy studied design features for lessons applicable to indigenous programs.
The class influenced subsequent strategic submarine programs and naval doctrine debated in circles that include the Russian Ministry of Defence, strategists trained at the Voroshilov Naval Institute, and policymakers who participated in bilateral talks such as the START negotiations. Engineering advances informed by the platform were incorporated into newer projects developed at Rubin Design Bureau and industrial centers like Sevmash, while operational lessons affected anti-submarine warfare concepts practiced by NATO commands headquartered in locations including Brussels and Northwood. The class thus occupies a place in Cold War maritime history alongside vessels associated with periods marked by leaders like Nikita Khrushchev and Vladimir Putin.
Category:Submarines of the Soviet Navy Category:Submarines of Russia