Encyclopedia Astronautica

8K84 back
Credit: © Mark Wade
N2O4/UDMH propellant rocket stage. Loaded/empty mass 32,799/3,000 kg. Thrust 868.80 kN. Vacuum specific impulse 310 seconds. Orevo has sectioned hardware. Total mass, sea level thrust accurate; Isp, empty mass and burn time estimated. Source: Placard, Orevo.

No Engines: 4.

AKA: 8K84 Stage 1.
Status: Retired 1984.
Gross mass: 32,799 kg (72,309 lb).
Unfuelled mass: 3,000 kg (6,600 lb).
Height: 10.00 m (32.00 ft).
Diameter: 1.60 m (5.20 ft).
Span: 1.60 m (5.20 ft).
Thrust: 868.80 kN (195,314 lbf).
Specific impulse: 310 s.
Specific impulse sea level: 280 s.
Burn time: 102 s.
Number: 115 .

More... - Chronology...

Associated Countries
Associated Engines
  • RD-0215 Kosberg N2O4/UDMH rocket engine. 2450 kN. Developed 1962-65 for heavy Chelomei launcher (UR-900?) stage 1. Isp=310s. Engine unit consisting of 1 RD-0217 for tank pressurization and three RD-0216. Hardware not hot-tested. More...
  • RD-0216 Kosberg N2O4/UDMH rocket engine. 219 kN. UR-100 stage 1. Isp=313s. Staged combustion cycle. Includes tank pressurization system (RD-0217 without tank press.). First launch November 1963, manufactured until 1974, operational until 1991. First flight 1965. More...
  • RD-0217 Kosberg N2O4/UDMH rocket engine. 219 kN. UR-100, UR-100K stage 1. Out of Production. Staged combustion cycle. Version of RD-0216 without tank pressurization system. Manufacturing until 1974, operational use until 1991. Isp=313s. More...

Associated Launch Vehicles
  • UR-100M SLBM Russian intercontinental ballistic missile. The UR-100M designation was used for a naval version of the UR-100, developed by Chelomei in 1962-1964. This would fit in the Navy's D-8 launch system. It was rejected in favour of the R-29 from Makeyev, who became the Navy's traditional supplier of SLBM's. More...
  • UR-100 Russian intercontinental ballistic missile. The UR-100 lightweight ICBM was the Soviet answer to the US Minuteman and was deployed in larger numbers than any other in history. It remained an enigma outside of intelligence circles in the West until after the collapse of the Soviet Union. It allowed the Soviet Union to match, and then surpass the United States in strategic deterrent capability. As such it was Vladimir Chelomei's crowning legacy to his country. More...
  • UR-100K Russian intercontinental ballistic missile. The UR-100K was a version of the 8K84M with further improvements in accuracy and capable of delivering three separate (but not independently targeted) re-entry vehicles. More...
  • UR-100M Russian intercontinental ballistic missile. The 8K84M was an improved version of the UR-100 with an improved empty mass fraction, a new guidance system, countermeasures capability, and post-boost manoeuvrability to defeat enemy anti-ballistic missile systems. More...
  • UR-100U Russian intercontinental ballistic missile. The UR-100U was a development of the UR-100K with improved shock isolation in the silo. More...

Associated Propellants
  • N2O4/UDMH Nitrogen tetroxide became the storable liquid propellant of choice from the late 1950's. Unsymmetrical Dimethylhydrazine ((CH3)2NNH2) became the storable liquid fuel of choice by the mid-1950's. Development of UDMH in the Soviet Union began in 1949. It is used in virtually all storable liquid rocket engines except for some orbital manoeuvring engines in the United States, where MMH has been preferred due to a slightly higher density and performance. More...

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