R-39 missile
Encyclopedia
The R-39 Rif, or Rif-Ma was a Russia
Russia
Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

n submarine launched ballistic missile (SLBM). It had the NATO reporting name
NATO reporting name
NATO reporting names are classified code names for military equipment of the Eastern Bloc...

 of SS-N-20 Sturgeon and the bilateral arms control designation RSM-52. It was carried on board submarines of the Typhoon
Typhoon class submarine
The Project 941 or Akula, Russian "Акула" class submarine is a type of nuclear-powered ballistic missile submarine deployed by the Soviet Navy in the 1980s...

 class from 1983 until it was withdrawn from service in 2004.

The R-39 was an intercontinental missile, it had a three stage solid-fuel boost design with a liquid-fuel post-boost unit carrying up to ten MIRV warheads. Like other SLBMs the initial launch was powered by a gas generator in the bottom of the firing tube, during the missile's passage through the water additional motors produce a gaseous wall around the missile, reducing hydrodynamic resistance. The launch system was designated D-19.

The missiles had GRAU
Grau
Grau is a German word meaning "gray" and a Catalan word meaning "grade". It may refer to:* BAP Almirante Grau , a De Zeven Provinciën class cruiser in service with the Peruvian Navy* Grau Käse, Tyrolean grey cheese...

 indices of 3M65, 3M20, and 3R65.

Development work began at NII Mashinostroyeniya in 1971 and the design gained official approval in 1973. Initial test flights from 1979 found problems in the solid-fuel boost engines, over half of the early flights failed. Later tests aboard a modified Typhoon class submarine
Typhoon class submarine
The Project 941 or Akula, Russian "Акула" class submarine is a type of nuclear-powered ballistic missile submarine deployed by the Soviet Navy in the 1980s...

 were more successful and deployment began in May 1983, with 20 missiles in each submarine. At full deployment, 120 missiles were deployed with 1,200 total warheads.

Under the terms of the Start I
START I
START was a bilateral treaty between the United States of America and the Union of Soviet Socialist Republics on the Reduction and Limitation of Strategic Offensive Arms. The treaty was signed on 31 July 1991 and entered into force on 5 December 1994...

 and Start II
START II
START II was a bilateral treaty between the United States of America and Russia on the Reduction and Limitation of Strategic Offensive Arms. It was signed by United States President George H. W...

 treaties, from 1996 a number of R-39 missiles were destroyed. Throughout the 1990s, Typhoon class submarines and the R-39 missiles they carried were gradually withdrawn from service. All the missiles were decommissioned by 2004 and all the Typhoon class submarines have been retired, except for one which is to be used as a test platform for the next generation Bulava missile.

A successor design, R-39M
R-39M
R-39UTTH "Bark", NATO reporting name of SS-N-28, was a Russian submarine-launched ballistic missile. The missile was an upgraded version of the R-39 missile that was designed for the Typhoon class. The new missile was to be carried by the new Russian nuclear submarines of the Borei class...

Grom /RSM-52V/SS-N-28 for D-19UTTKh launch system, suffered a succession of testing failures and was cancelled.

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