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Ballistic Missile Submarine (Nuclear Powered)

667 BDRM "Delfin" class

(NATO Codename Delta IV)

Crew 135 men
Operational diving depth 320 m
Maximum diving depth 400 m
Sea endurance 80 days
Dimensions and weight 
Length 167 m
Surfaced displacement 11 740 tones
Submerged displacement (full load) 18 200 tones
Propulsion and speed 
Surfaced speed 14 knots 
Submerged speed  24 knots 
Nuclear reactors 2 x 90 MW
Turbines 2 x 20 000 kW
Turbo generators 2 x 3000 kW
Diesel generators 2 x 460 kW
Propellers 2 x 7-blade
Missiles 16 x RSM-54 (SS-N-23 Skiff) 
Torpedoes 4 x 533-mm torpedo tubes,  18 Mk 40 anti-ship torpedoes or Novator (SS-N-15 Starfish) anti-ship missiles
The Russian Navy operates seven Project 667 BDRM "Delfin" class strategic missile submarines. The submarines operate in the Northern Fleet and are based at the Saida Guba Naval Base.

The submarines were built at the Severodvinsk Shipyard from 1981 to 1992. The first of class, K51, was commissioned in December 1985. In NATO countries they are referred to as the "Delta IV" class submarines.

The submarine design is similar to Project 667 BDR ("Delta III" class). The submarine constitutes a double-hulled configuration with missile silos housed in the inner hull.

The nose horizontal hydroplanes are arranged on the sail. They can rotate to the vertical for breaking through the ice cover. The operational diving depth of the submarine is 320 metres with a maximum depth of 400 metres. The propulsion system provides a run speed of 24 knots surfaced and 24 knots submerged. The submarine carries supplies for an endurance of 80 days. The surface of the submarine has an acoustic coating to reduce the acoustic signature.

The "Delfin" submarines are strategic nuclear missile submarines designed to carry out strikes on military and industrial installations and naval bases. The submarine carries the RSM-54 Makeyev's construction bureaus missiles (NATO designation: SS-N-23 Skiff) submarine-launched ballistic missile (SLBM). The RSM-54 is a three-stage liquid-propellant ballistic missile with a range of 8,300 kilometers. The warhead consists of four to ten multiple independently targeted re-entry vehicles (MIRVs) each rated at 100 kT. The missile uses stellar inertial guidance to provide a circle of equal probability (CEP) of 500 metres. The CEP value is a measure of the accuracy of strike on the target and is the radius of the circle within which half the strikes will impact.

The submarine is also capable of launching the Novator SS-N-15 Starfish anti-ship missile or Mk 40 anti-ship torpedoes. Starfish is armed with a 200 kT nuclear warhead and has a range of up to 45 kilometres.

The submarine has four 533mm torpedo tubes capable of launching all types of torpedoes, including antisubmarine torpedoes and antihydro-acoustic devices. The system is fitted with a rapid reloading torpedo system. The submarine can carry up to 18 missiles or torpedoes. All torpedoes are accommodated in the bow section of the hull.

The submarines' radar warning receiver is the Brick Pulp system. The optronic mast is the Brick Spit.

The Snoop Tray surface search radar operates at I-band.

The sonar suite includes the hull mounted Shark Gill sonar, which operates at low and medium frequencies in active and passive search and attack mode. The Mouse Roar active attack sonar is hull mounted and operates at high frequency. The Shark Hide flank array sonar is a passive low frequency system. A Pelamida towed array sonar provides a very low frequency passive search capability. The dispenser for the thin line towed array is visible on the after fin.

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.

The "Delfin" is nuclear-powered with two VM-4 pressure water reactors rated at 180 MW. There are two turbines, type GT3A-365 rated at 27.5 MW. The propulsion system drives two shafts with seven bladed fixed pitch propellers.

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