R-21 (missile)

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R-21 (NATO Reporting name SS-N-5 Serb)
Type	submarine-launched ballistic missile
Service history
In service	15 May 1963
Specifications
Weight	19.6 t
Length	14.2 m
Diameter	1.3 m

Warhead	single nuclear 800kt to 1.0 Mt^[1]

Engine	liquid-fuel rocket, single stage
Operational range	about 1450 km (CEP: 2.8 km)
Guidance system	inertial navigation system
Launch platform	project 629B submarines

The R-21 was a submarine-launched ballistic missile developed and deployed by the Soviet Union from 15 May 1963 through 1989. The development was authorized for OKB-586 of M.Yangel on 20 March 1958 (simultaneously with R-15), then transferred to SKB-385 of Makeev on 17 March 1959. It was assigned the NATO reporting name SS-N-5 Serb and carried the GRAU index 4K55^[2]. The submarine missile complex was named D-4 for project 629B submarines.

The D-4 launch complex with R-21 missile has entered service by a Decision of Ministry Soviet of the USSR of 15 May 1963. Retired in 1989. There were 21 submarines with D-4 complex aboard, 63 missiles on combat duty, 228 launches (193 successful, 19 failed due to hardware bugs, 11 failed due to personnel errors and faults of supplementory systems).

Fuel for the missile was designated AK-27I/TG-02, which consisted of two liquids, a mixture of 73% HN03 Nitrogen Tetroxide and 27% N204 concentrated Nitric Acid, and an Amine based fuel.^[3]

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v • d • e Russian and former Soviet "R" designation sequence

R-1 · R-2 · R-3 · R-4 · R-5 · R-7 · R-8 · R-9 · R-11 · R-12 · R-13 · R-14 Chusovaya · R-15 · Tumansky R-15 · R-16 · R-21 · R-23 · R-26 · R-27, Vympel R-27 · R-29 · R-33 · R-36 · R-37 · R-39 · R-40 · R-46, GR-1 · R-60 · R-73 · R-77 · 81R · R-101 · R-103 · R-172 · R-300 Elbrus · R-400

Other	TR-1 · RS-24 · RS-82 · RT-2 · RT-2PM · RT-2UTTH · RT-15 · RT-20 · RT-21 · RT-23 · RT-25 · RSM-56 · RKV-500A, RK-55 · KSR-5 · RSS-40 · UR-100 · UR-100 · UR-100N