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Sierra class submarine: Wikis


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Sierra II.jpg
Class overview
Builders: Gorky, later towed to Severodvinsk for completion
Operators:  Soviet Navy
 Russian Navy
Preceded by: Alfa class submarine
Succeeded by: Akula class submarine
Completed: 4
Active: 2 К-276/B-276 "Kostroma" (Project 645)
К-336/B-336 "Pskov" (Project 945A)
Lost: 0
Retired: 2 B-239 Carp)
К-534/B-534 "Nizhniy Novgorod" (Project 945A)
General characteristics
Displacement: Sierra I:
7,200 tons (surfaced)
8,100 tons (submerged)
Sierra II:
7,600 tons (surfaced)
9,100 tons (submerged)
Length: Sierra I: 351 ft (107 m)
Sierra II: 364.2 ft (111.0 m)
Beam: Sierra I: 41 ft (12 m)
Sierra II: 46.6 ft (14.2 m)
Propulsion: Sierra I & II: 1 × PWR, 190 MW
2 × 1,002 hp emergency motors
1 shaft, 2 spinners
Speed: Sierra I & II: 10 knots (18.5 km/h) (surfaced)
Sierra I: 34 knots (63.0 km/h) (submerged)
Sierra II: 32 knots (59.3 km/h) (submerged)
Range: Effectively unlimited, except by food supplies
Complement: Sierra I & II: 61
Armament: Sierra I & II:
4 × 25.6 in (650 mm) torpedo tubes
4 × 21 in (530 mm) torpedo tubes
SS-N-21 Sampson SLCM with 200 kT nuclear warhead
SS-N-15 Starfish anti submarine weapon: 200 kT depth charge or 90 kg HE Type 40 torpedo
SS-N-16 Stallion, 200 kT depth charge or 90 kg HE Type 40 torpedo
Minelaying configuration: 42 mines instead of torpedoes

The Sierra I class (NATO reporting name) or Project 945 (Барракуда/Barrakuda) nuclear submarine was the Soviet Union's successor class to the partly successful Project 705 Lira (Alfa) class submarine. The Sierra class has a light and strong titanium pressure hull which enables the class to dive to greater depths, reduce the level of radiated noise and increase resistance to torpedo attacks.

The Sierra II class (NATO reporting name) or Project 945A (Кондор/Kondor) nuclear submarine was a high tensile strength steel design.


Sierra I

The first hull, Karp, was laid down in May 1982 at the Gorky shipyard and was launched in August 1983 before being transferred to Severodvinsk for fitting out. It was laid up in 1997. The next hull to be built was the Krab, which was launched in July 1986 and was commissioned in September 1987. Krab was renamed Kostroma and is still in service with the Russian Northern fleet. The Sierra I type was also fitted with a releasable escape pod for the crew. The pod is covered by a V shaped casing on the port side of the sail.

Soviet titanium technology was far in advance of the West's requiring fewer passes to achieve weld at the disadvantage of the cost of each hull which limits numbers built despite the advantages of greater depths and underwater speed. This was clearly shown in the Sierra class.

Active submarines:

B-276 Kostroma

Sierra II

The Sierra II (Project 945.A - Кондор/Kondor) type has a considerably larger sail which is 16.5 ft (5.0 m) longer than the Sierra I type. The sail also has a curious flat, square leading edge which must impact hydrodynamic quietening. The masts are offset on the starboard side to make way for two escape pods in the sail. The starboard side also has a 10-point environment sensor fitted at right angles to the front end of the sail. Also, the Sierra II type has a much larger pod on its after fin. The pod houses the Skat 3 passive very low frequency towed array.

Active submarines:

B-336 Pskov

Sierra III (provisional)

The sole Sierra III/Project 945AB (Mars), was laid down in March 1990 but was scrapped in November 1993 before completion. Cited authoritative reference has no mention of additional hulls.[1], with the second and third cancelled before the keel was laid.[2]

While only one is considered to be completely operational, the first hull of the series is due to be brought for repair at the Zvezdochka Shipyard, Severodvinsk in 2007.


  1. ^ Подводные Лодки, Том 1, Часть 2, Ю.В. Апалков, Санкт Петербург, 2003
  2. ^ Sierra Class - Project 945
  • Robert Hutchinson, Submarines, War Beneath The Waves, From 1776 To The Present Day
  • - Article from FAS
  • Article Template:Ri icon


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