{
  "id": "delta-iv",
  "name": "Delta IV Class (Project BDRM Delfin Class)",
  "aliases": [],
  "domain": "naval",
  "country": "RUS",
  "category": "Nuclear-powered ballistic missile submarine",
  "status": null,
  "fielded": 1985,
  "operators": [
    "RUS"
  ],
  "prolif_count": 1,
  "summary": "The Delta IV Class (Project BDRM Delfin Class) Russian Nuclear-Powered Ballistic Missile Submarine. Seven Delta IV-class submarines were built; all are still in service in the Russian Navy.",
  "specs": [
    {
      "k": "crew",
      "v": 135,
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "length_m",
      "v": 167,
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "beam_m",
      "v": 12.2,
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Draft",
      "section": "dims",
      "v": "8.8 m",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Displacement (surface)",
      "section": "dims",
      "v": "11,740 tons",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "displacement_t",
      "v": 15500,
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium",
      "label": "Displacement (submerged)"
    },
    {
      "k": "propulsion",
      "v": "2 x VM-4SG",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Engine power",
      "section": "mobility",
      "v": "60,000 total shp",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Operating depth",
      "section": "mobility",
      "v": "380 m",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Endurance",
      "section": "mobility",
      "v": "80 days",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Sensors note",
      "section": "firecontrol",
      "v": "The submarine has two floating VLF and ELF antenna buoys to receive radio messages, target designation data, and satellite navigation signals while remaining at a safe depth.",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Surface Search / Navigation Radar",
      "section": "firecontrol",
      "v": "1 x MRK-50 Albatros (Snoop Tray) surface search/navigation",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Active / Passive Sonar",
      "section": "firecontrol",
      "v": "1 x MGK-500 series Skat-BDRM (Shark Gill) active/passive low-frequency suite",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Active Mine-Avoidance Sonar",
      "section": "firecontrol",
      "v": "1 x MGK-519 (Mouse Roar**) active mine-avoidance sonar",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Towed Passive Array Sonar",
      "section": "firecontrol",
      "v": "1 x Pelamida towed passive array",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Caivation Monitor",
      "section": "firecontrol",
      "v": "1 x MG-512 cavitation monitor",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Upward-Looking Echo Sounder",
      "section": "firecontrol",
      "v": "1 x MG-518 upward-looking echo sounder",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Mine-Detection Sonar",
      "section": "firecontrol",
      "v": "1 x MG-519 mine-detection",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Sound-Velocity Measurement",
      "section": "firecontrol",
      "v": "1 x MG533 sound-velocity measurement",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Ice-Lane Detector",
      "section": "firecontrol",
      "v": "1 x NOR-1 active ice-lane detector",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Surface Warning Sonar",
      "section": "firecontrol",
      "v": "1 x NOK-1 active surface warning",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Hull Armor",
      "section": "protection",
      "v": "These are double-hull submarines, with the forward diving planes mounted on the sail. The diving planes can rotate to vertical for breaking through ice.The submarines have a high freeboard",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "NBC Water Washdown System",
      "section": "protection",
      "v": "Yes",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "EW Intercept",
      "section": "protection",
      "v": "1 x MRP-10 Zaliv-P (Brick Pulp) intercept",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "EW Direction Finder",
      "section": "protection",
      "v": "1 x Park Lamp** direction-finder",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Torpedo System: torpedo tube launcher",
      "section": "armament",
      "v": "4 x 533-mm bow tubes",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Torpedo System: basic load",
      "section": "armament",
      "v": "12 x torpedoes",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "armament",
      "v": "16 x SS-N-23 Skiff",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium"
    },
    {
      "k": "hulls",
      "v": 8,
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium",
      "note": "Hulls listed in the source card"
    }
  ],
  "payloads": [
    {
      "name": "16 x SS-N-23 Skiff",
      "role": "Intercontinental-Range Submarine-Launched Ballistic Missile (SLBM)",
      "src": [
        "weg-delta-iv"
      ],
      "conf": "medium",
      "caps": {
        "Type": "Intercontinental-Range Submarine-Launched Ballistic Missile (SLBM)",
        "Guidance": "Astroinertial",
        "Warhead": "Nuclear",
        "Length": "14.9 m"
      },
      "range_km": 8300,
      "qty": "16 x SS-N-23 Skiff (R-29RM Shtil) Intercontinental-Range Submarine-Launched Ball"
    }
  ],
  "variants": [
    {
      "name": "Delta I (Project 667B Murena)",
      "text": "No Longer in Service. The Delta-class submarines could deploy on alert patrols in the marginal ice-seas of the Soviet Arctic littoral, including the Norwegian and Barents Seas.",
      "src": [
        "weg-delta-iv"
      ]
    },
    {
      "name": "Delta II (Project 667BD Murena-M)",
      "text": "No Longer in Service. The Delta II-class submarine was a large ballistic missile submarine designed to remedy shortcomings in the Delta I-class submarine.",
      "src": [
        "weg-delta-iv"
      ]
    },
    {
      "name": "Delta III (Project 667BDR Kalmar)",
      "text": "Only one vessel on active status. The 667BDR Kal'mar (Squid) Delta III-class submarine is a large ballistic missile submarine. Like the earlier Delta-class submarines the Delta III class is a double-hulled design with a thin, low magnetic steel outer hull…",
      "src": [
        "weg-delta-iv"
      ]
    },
    {
      "name": "Delta IV (Project 667BDRM Delfin)",
      "text": "Seven Delta IV-class submarines were built; all are still in service in the Russian Navy. The submarines, based at the Sayda Guba Naval Base, operate in the Northern Fleet. The Severodvinsk Shipyard built these vessels between 1981 and 1992.",
      "src": [
        "weg-delta-iv"
      ]
    },
    {
      "name": "Delta IV Stretch class/PODMOSKOVYE speci",
      "text": "This DELTA IV-class submarine was modified for special missions. The missile compartment was removed and replaced with a module capable of deploying mini-submarines.",
      "src": [
        "weg-delta-iv"
      ]
    },
    {
      "name": "VERKHOTURYE  (ex-Russian IMENI XXVI SEZD",
      "text": "Commissioned: 1985 Class: Delta IV Class Status: Active Fleet: Northern Fleet",
      "src": [
        "weg-delta-iv"
      ]
    },
    {
      "name": "Ekaterinburg",
      "text": "Commissioned: 1985 Class: Delta IV Class Status: Active Fleet: Northern Fleet",
      "src": [
        "weg-delta-iv"
      ]
    },
    {
      "name": "Podmoskovye",
      "text": "Commissioned:1986 Class: Delta IV Class Status: Active Fleet: Northern Fleet",
      "src": [
        "weg-delta-iv"
      ]
    }
  ],
  "art": "submarine",
  "image": null,
  "verified": null,
  "changelog": [
    {
      "date": "2026-10-10",
      "change": "Entry created from the Worldwide Equipment Guide (ODIN), bulk import"
    }
  ],
  "url": "https://www.defensepedia.com/systems/delta-iv.html",
  "sources": {
    "weg-delta-iv": {
      "title": "Delta IV Class (Project BDRM Delfin Class) Russian Nuclear-Powered Ballistic Missile Submarine",
      "publisher": "U.S. Army TRADOC G-2 Worldwide Equipment Guide (ODIN)",
      "url": "https://odin.t2com.army.mil/WEG/Asset/Delta_IV_Class_Project_BDRM_Delfin_Class_Russian_Nuclear-Powered_Ballistic_Missile_Submarine",
      "published": "2026-03-20",
      "tier": 1,
      "checked": "2026-10-10"
    }
  }
}