Missile R-29 (SS-N-18 Stingray)

The R-29 family of submarine-launched ballistic missiles originated in the Soviet Union. The system entered service in 1974.

The R-29 is a two-stage, liquid-propellant missile. All variants utilize an astro-inertial guidance system. The initial R-29 variant carried a single 800 kt nuclear warhead. The R-29R variant, which entered service in 1978, carried three 500 kt warheads. The R-29RK variant carried seven 100 kt warheads, and the R-29RL utilized a single 450 kt warhead. Current active variants include the R-29RMU Sineva and the R-29RMU2 Layner.

The R-29 family was originally operated by the Soviet Navy and remains in service with the Russian Navy. The missiles are deployed on Delta-class ballistic missile submarines. The R-29 was fielded on Delta I and Delta II vessels, while the R-29R and its sub-variants were carried by Delta III submarines. The current operational inventory consists of R-29RMU and R-29RMU2 missiles deployed on Delta IV class submarines, including the Verkhoturye, Tula, Karelia, and Novomoskovsk. There are no recorded instances of the R-29 being used in combat.