R-27 Zyb

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Simple scheme of an R-27 missile R-27 (SS-N-6) SLBM.jpg
Simple scheme of an R-27 missile

The R-27 Zyb was a submarine-launched ballistic missile developed by the Soviet Union and employed by the Soviet Navy from 1968 through 1988. NATO assigned the missile the reporting name SS-N-6 Serb. In the USSR, it was given the GRAU index 4K10. It was a liquid fuel rocket using a hypergolic combination of unsymmetrical dimethylhydrazine (UDMH) as fuel, and nitrogen tetroxide (NTO) as oxidizer. [1] Between 1974 and 1990, 161 missile launches were conducted, with an average success rate of 93%. [2] Total production was 1800 missiles.


The R-27 [3] missiles were deployed on the Yankee I submarines, including the K-219.



R-27U (RSM-25)


The 4K18 was a Soviet medium-range anti-ship ballistic missile (also known as R-27K, where "K" stands for Korabelnaya which means "ship-related") NATO SS-NX-13. The missile was a two-stage development of the single-stage R-27, the second stage containing the warhead as well as propulsion and terminal guidance. [4] Initial submarine testing began on 9 December 1972 on board the K-102, a project 605 class submarine, a modified Project 629/ NATO Golf class lengthened 17.1m (formerly B-121), to accommodate four launch tubes as well as the Rekord-2 fire control system, the Kasatka B-605 Target acquisition system and various improvements to the navigation and communications systems. Initial trials ended on 18 December 1972 because the Rekord-2 fire control system hadn't been delivered yet. After a number of delays caused by several malfunctions, test firings were finally carried out between 11 September and 4 December 1973. Following the initial trials, the K-102 continued making trial launches with both the R-27 and the R-27K, until it was accepted for service on 15 August 1975. [5]

Using external targeting data, the R-27K/SS-NX-13 would have been launched underwater to a range of between 350-400 nm (650–740 km), covering a "footprint" of 27 nm (50 km). The Maneuvering Re-Entry vehicle (MaRV) would then home in on the target with a CEP of 400 yards (370 m). Warhead yield was between 0.5-1 Mt. [6]

The missile system never became operational, since every launch tube used for the R-27K counted as a strategic missile in the SALT agreement, and they were considered more important. [7]

Although the R-27K could fit in the launch tubes of the Project 667A (NATO Yankee class), the subs lacked the necessary equipment to target and fire the missile. [8]


Map with R-27 Zyb operators in blue with former operators in red R-27 Zyb operators.png
Map with R-27 Zyb operators in blue with former operators in red
Flag of the Soviet Union.svg  Soviet Union
The Soviet Navy was the only operator of the R-27.
Flag of Iran.svg Iran
Operates the Khorramshahr, a heavily modified design based on the R-27.
Flag of North Korea.svg North Korea
possibly operates the Hwasong-10, a modified variant of the R-27, some sources suggest North Korea might have abandoned development of the design due to its complexity. [9]

See also

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  1. Oleg Bukharin; Pavel Podvig; Pavel Leonardovich Podvig (2004). Russian Strategic Nuclear Forces. MIT Press. p. 321. ISBN   9780262661812 . Retrieved 12 April 2013.
  2. USSR R-27 missile
  3. Korabli VMF SSSR, Vol. 1, Part 1, Yu. Apalkov, Sankt Peterburg, 2003, ISBN   5-8172-0069-4
  4. Polmar, Norman (2004). Coldwar submarines. USA: Potomac Books Inc. p. 180. ISBN   978-1-57488-594-1.
  5. Polmar, Norman (2004). Coldwar submarines. USA: Potomac Books Inc. p. 180. ISBN   978-1-57488-594-1.
  6. Polmar, Norman (2004). Coldwar submarines. USA: Potomac Books Inc. p. 180. ISBN   978-1-57488-594-1.
  7. Polmar, Norman (2004). Coldwar submarines. USA: Potomac Books Inc. p. 180. ISBN   978-1-57488-594-1.
  8. Polmar, Norman (2004). Coldwar submarines. USA: Potomac Books Inc. p. 180. ISBN   978-1-57488-594-1.
  9. "North Korea's Army Day Military Parade: One New Missile System Unveiled | 38 North: Informed Analysis of North Korea". 38 North. 2018-02-08. Retrieved 2021-04-05.