R-13 (missile)

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.

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.

Soviet design to use a small set of rocket engines (vernier thrusters) to perform course and trajectory alterations instead of aerodynamic control surfaces, although a set of four stabilizers were used to keep the missile on-course during initial flight.