Encyclopedia Astronautica
R-7 8K71-0


Lox/Kerosene propellant rocket stage. Loaded/empty mass 43,100/3,500 kg. Thrust 970.00 kN. Vacuum specific impulse 306 seconds.

Cost $ : 5.000 million.

Status: Retired 1961.
Gross mass: 43,100 kg (95,000 lb).
Unfuelled mass: 3,500 kg (7,700 lb).
Height: 19.00 m (62.00 ft).
Diameter: 2.68 m (8.79 ft).
Span: 2.68 m (8.79 ft).
Thrust: 970.00 kN (218,060 lbf).
Specific impulse: 306 s.
Specific impulse sea level: 250 s.
Burn time: 120 s.
Number: 208 .

More... - Chronology...


Associated Countries
Associated Engines
  • RD-107-8D74 Glushko Lox/Kerosene rocket engine. 971 kN. R-7 8K71, Vostok 8K72, Vostok 8K72K strap-ons. Isp=306s. First flight 1957. Used four combustion chambers fed by single turbopump to circumvent combustion instability problems with larger chambers 1950's. More...

Associated Launch Vehicles
  • R-7 Russian intercontinental ballistic missile. The world's first ICBM and first orbital launch vehicle. The 8K71 version was never actually put into military service, being succeeded by the R-7A 8K74. More...

Associated Propellants
  • Lox/Kerosene Liquid oxygen was the earliest, cheapest, safest, and eventually the preferred oxidiser for large space launchers. Its main drawback is that it is moderately cryogenic, and therefore not suitable for military uses where storage of the fuelled missile and quick launch are required. In January 1953 Rocketdyne commenced the REAP program to develop a number of improvements to the engines being developed for the Navaho and Atlas missiles. Among these was development of a special grade of kerosene suitable for rocket engines. Prior to that any number of rocket propellants derived from petroleum had been used. Goddard had begun with gasoline, and there were experimental engines powered by kerosene, diesel oil, paint thinner, or jet fuel kerosene JP-4 or JP-5. The wide variance in physical properties among fuels of the same class led to the identification of narrow-range petroleum fractions, embodied in 1954 in the standard US kerosene rocket fuel RP-1, covered by Military Specification MIL-R-25576. In Russia, similar specifications were developed for kerosene under the specifications T-1 and RG-1. The Russians also developed a compound of unknown formulation in the 1980's known as 'Sintin', or synthetic kerosene. More...

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