Encyclopedia Astronautica
GR-1 Stage 3


Lox/Kerosene propellant rocket stage. Loaded/empty mass 8,500/1,000 kg. Thrust 66.60 kN. Vacuum specific impulse 350 seconds. Masses estimated based on total vehicle mass of 117 tonnes. This stage was a close cousin of that developed for the Molniya launch vehicle.

AKA: 8K513 Blok V.
Gross mass: 8,500 kg (18,700 lb).
Unfuelled mass: 1,000 kg (2,200 lb).
Height: 4.60 m (15.00 ft).
Diameter: 2.41 m (7.90 ft).
Span: 2.41 m (7.90 ft).
Thrust: 66.60 kN (14,972 lbf).
Specific impulse: 350 s.
Burn time: 380 s.

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Associated Countries
Associated Engines
  • 8D726 Korolev Lox/Kerosene rocket engine. 66.7 kN. GR-1 Stage 3, N-11GR - V. Development based on S1.5400. Isp=350s. More...

Associated Launch Vehicles
  • 8K513 Russian anti-satellite missile. ASAT version. Little has emerged about Korolev's ASAT project, designed in competition with Chelomei's in 1961-1964. 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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