Encyclopedia Astronautica
R-11FM


Nitric acid/Kerosene propellant rocket stage. Loaded/empty mass 4,473/1,080 kg. Thrust 92.83 kN. Vacuum specific impulse 250 seconds. First Russian submarine-launched ballistic missile. Range 150 km with 967 kg warhead. Accuracy 1.5 km in range, 0.75 km lateral.

Status: Out of production.
Gross mass: 4,473 kg (9,861 lb).
Unfuelled mass: 1,080 kg (2,380 lb).
Height: 7.40 m (24.20 ft).
Diameter: 0.88 m (2.88 ft).
Span: 1.82 m (5.97 ft).
Thrust: 92.83 kN (20,869 lbf).
Specific impulse: 250 s.
Specific impulse sea level: 218 s.
Burn time: 63 s.
Number: 29 .

More... - Chronology...


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-11FM First Russian submarine-launched ballistic missile. Following protracted testing the design was accepted by the military in 1959 but never put into operational service. 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...

Home - Browse - Contact
© / Conditions for Use