Encyclopedia Astronautica

EKR ramjet 160 pixel
Credit: © Mark Wade
Nitric acid/Kerosene propellant rocket stage. Loaded/empty mass 4,660/955 kg. Thrust 93.28 kN. Vacuum specific impulse 251 seconds. First Russian ballistic missile using storable propellants. Enlargement/elaboration of German Wasserfall SAM. Developed by Korolev OKB, then Makeyev OKB spun off to develop Army and SLBM derivatives. Range 270 km with 690 kg, accuracy 1.5 km/0.75 km. Maximum altitude 78 km. Time of flight 5.4 minutes. Max velocity at burnout 1430 m/s. Source: Wall chart, Russian Space Agency HQ, Moscow.

AKA: 8A61.
Status: Retired 1965.
Gross mass: 4,660 kg (10,270 lb).
Unfuelled mass: 955 kg (2,105 lb).
Height: 7.42 m (24.34 ft).
Diameter: 0.88 m (2.88 ft).
Span: 1.82 m (5.96 ft).
Thrust: 93.28 kN (20,970 lbf).
Specific impulse: 251 s.
Specific impulse sea level: 219 s.
Burn time: 78 s.
Number: 54 .

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Associated Countries
Associated Engines
  • S2.253 Isayev Nitric acid/Kerosene rocket engine. 93.3 kN. R-11 (Scud B) 8A61. Thrust 8300 kgf at sea level. Fuel Kerosene T-1, chemical ignition by TG-02. Isp=251s. First flight 1953. More...

Associated Launch Vehicles
  • R-11 First Russian ballistic missile using storable propellants, developed from the German Wasserfall SAM by Korolev's OKB. The design was then spun off to the Makeyev OKB for development of Army (R-17 Scud) and SLBM (R-11FMA) derivatives. More...
  • R-11M Russian submarine-launched ballistic missile. Improved production version of R-11, not retired until 1977. More...
  • R-11A Russian suborbital launch vehicle. Version of the R-11 'Scud' missile used as a sounding rocket. First launched in 1957, and capable of taking 250 to 400 kg of payload to 100 to 160 km altitude. The payloads were enclosed in a spherical re-entry capsule, which was gyro-stabilised to ensure instruments could be pointed precisely at the sun or other astronomical target. More...
  • R-17 Russian short-range ballistic missile. The final refinement of the R-11 design, the R-17, was exported widely and became infamous around the world by its ASCC reporting name - "Scud". It was perhaps the most famous ballistic missile of the post-war period due to its use in the Iran-Iraq 'War of the Cities' and the Gulf War. This was the definitive production version of what was essentially a storable-propellant rocket with the performance of the V-2. The original design was by Makeyev but the missile itself was produced by the Votkinsk Machine Building Plant. More...
  • R-11A-MV Russian suborbital launch vehicle. Sounding rocket version of R-11 with increased payload. More...

Associated Propellants
  • Nitric acid/Kerosene Drawing on the German World War II Wasserfall rocket, nitric acid (HNO3) became the early storable oxidiser of choice for missiles and upper stages of the 1950's. To overcome various problems with its use, it was necessary to combine the nitric acid with N2O4 and passivation compounds. These formulae were considered extremely secret at the time. By the late 1950's it was apparent that N2O4 by itself was a better oxidiser. Therefore nitric acid was almost entirely replaced by pure N2O4 in storable liquid fuel rocket engines developed after 1960. Rocket propellant RP-1, or its foreign equivalents, is a straight-run kerosene fraction, which is subjected to further treatment, i.e., acid washing, sulphur dioxide extraction. Thus, unsaturated substances which polymerise in storage are removed, as are sulphur-containing hydrocarbons. More...

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