Encyclopedia Astronautica

Isayev Nitric acid/UDMH rocket engine. 157.5 kN. Kosmos-3M stage 2. Engine has one main and four steering nozzles. Thrust 157.5 + 4 x 25 kN. Precessor was 11D47 in R-14 (derivative ?) stage 2. Isp=303s. First flight 1964.

Application: Kosmos-3M stage 2.

Chambers: 1 + 4. Engine: 185 kg (407 lb). Chamber Pressure: 98.10 bar. Area Ratio: 103.4. Propellant Formulation: AK27I/UDMH. Thrust to Weight Ratio: 86.81. Oxidizer to Fuel Ratio: 2.65.

AKA: S5.23; 11D49.
Unfuelled mass: 185 kg (407 lb).
Height: 1.78 m (5.83 ft).
Diameter: 1.92 m (6.29 ft).
Thrust: 157.50 kN (35,407 lbf).
Specific impulse: 303 s.
Burn time: 4,305 s.
First Launch: 1960-64.
Number: 788 .

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Associated Countries
See also
Associated Launch Vehicles
  • Kosmos 65S3 Russian orbital launch vehicle. Prototype of light satellite launcher using as a first stage the Yangel R-14 (8K65) IRBM. The protoype system was launched eight times before production was handed over to the Krasnoryarsk Machine Factory. More...
  • Kosmos 11K65 Russian orbital launch vehicle. Initial serial production version was the Kosmos-3, built at the Krasnoryarsk Machine Factory. Flew only four times, with two failures, before being succeeded by the modernized production version under the responsibility of NPO Polyot. More...
  • Kosmos 11K65M Russian orbital launch vehicle. Definitive and prolific production version of satellite launcher based on Yangel R-14 IRBM. After further development at NPO Polyot (Omsk, Chief Designer A S Klinishkov), the modified Kosmos-3M added a restartable second stage with an orientation system. This booster was launched form two 'Cusovaya' launch complexes from 1967. The second stage used low thrust rockets using gas generator output to adjust the final velocity of the stage More...
  • Kosmos 65MP Russian orbital launch vehicle. Adaptation of 11K65M launcher for suborbital and single orbit test of subscale prototypes of Spiral and Buran manned spaceplanes (BOR-4 and BOR-5). More...

Associated Manufacturers and Agencies
Associated Propellants
  • Nitric acid/UDMH 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. 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...

  • Glushko, V P, Albom Konstruktsiy ZhRD, Vol. 1 1968, Vol. 3 & 4 1969 via Dietrich Haeseler.
  • Russian Arms Catalogue, Vol 5 and 6, Military Parade, Moscow via Dietrich Haeseler.

Associated Stages
  • S3 Nitric acid/UDMH propellant rocket stage. Loaded/empty mass 20,135/1,435 kg. Thrust 156.00 kN. Vacuum specific impulse 303 seconds. Launch count 411 orbital and ca. 300 suborbital to end 1994. Failures based on proration of failures to orbit. More...

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