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R-39
R-39
	R-39
Type	SLBM
Place of origin	Soviet Union
Service history
In service	1983–2004
Used by	Soviet Navy; Russian Navy
Production history
Designer	Makeyev Rocket Design Bureau
Manufacturer	Zlatoust Machine-Building Plant
Specifications
Mass	84 tonnes (185,000 lb)
Length	16.1 metres (53 ft) (8.4 metres (28 ft) without warhead)
Diameter	2.4 metres (7.9 ft)
Warhead	10 MIRV thermonuclear
Blast yield	100–200 kt each
Engine	Three-stage Solid-fuel rocket
Operational; range	8,300 kilometres (5,200 mi)
Guidance; system	Astro-inertial guidance
Accuracy	500 metres (1,600 ft) CEP

The R-39 (Russian: Р-39; NATO reporting name: SS-N-20 Sturgeon; bilateral arms control designation: RSM-52) was a submarine-launched ballistic missile (SLBM) that served with the Soviet Navy from its introduction in 1983 until 1991, after which it served with the Russian Navy until 2004. The missile had GRAU indices of 3M65, 3M20, and 3R65. It was carried on board Typhoon-class submarines.

An intercontinental missile, the R-39 had a three-stage solid-fuel boost design with a liquid-fuel post-boost unit carrying up to ten multiple independently targetable reentry vehicle 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.^{[citation needed]} The launch system was designated "D-19".

Development

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 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 and START II 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 Throughout the 1990s, Typhoon class submarines and the R-39 missiles they carried were gradually withdrawn from service.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 used as a test platform for the RSM-56 Bulava.

A successor design, R-39M Grom (Russian: Гром, Thunder)/RSM-52V/SS-N-28 for D-19UTTKh launch system, suffered a succession of testing failures and was cancelled.