The R-13 (Russian: ракета-13) was a submarine-launched ballistic missile (SLBM) developed by the Soviet Union starting around 1955. It was assigned the NATO reporting name SS-N-4 Sark and carried the GRAU index 4K50.
== History == Development of the R-13 was authorised by the Soviet Supreme Council on 25 July 1955 for use on the Project 629 and Project 658 submarines. The design work was started by OKB-1 under Sergei Korolev before being transferred to CB Miasskoe engineering / Makeyev Rocket Design Bureau (chief designer - Viktor Makeyev). Final technical specifications was approved by 11 January 1956. Serial production was undertaken at Zlatoust Machine-Building Plant in 1959. The R-13 was a single-stage liquid-fuel rocket and entered service in 1961. This missile was somewhat similar in design to the R-11FM missile, which caused some confusion in Western intelligence services during the Cold War. The missiles were phased out from 1965 to 1975. A set of four stabilizers and verniers were used to keep the missile on-course during initial flight. During initial testing before the missiles were deployed, 26 of 32 missiles (81%) were successfully launched. While the systems were deployed from 1961 to 1975, 225 of 311 launches (72%) were successful.
== Operators == Soviet Union Soviet Navy
== Specifications == Length: 11.8 m (38 ft 9 in) Diameter: 1.3 m (4 ft 3 in) Diameter (to stabilizers): 1.9 m (6 ft 3 in) Launch weight: 13.7 t Warhead: single thermonuclear: 1.2 to 2.0 Mt (perhaps as low as 1.0 Mt) Propulsion: liquid-fuel rocket, single stage Engine: Isaev S2.713 liquid rocket engine, 252 kN of thrust Oxidizer: AK-27I Fuel: TG-02 Range: about 600 km (370 mi) Launching technique: surfaced CEP: 1.8 to 4 km (1.1 to 2.5 mi)
== See also == List of missiles
References
FAS.org: R-13 / SS-N-4 Sark Ракетный комплекс Д-2 С БРПЛ Р-13(35-М-4) In Russian - inc diagrams