Encyclopedia Astronautica
Soyuz 7K-OKS PAO


Russian manned spacecraft module. 2 launches, 1971.04.23 (Soyuz 10) to 1971.06.06 (Soyuz 11). Soyuz 7K-OK basic PAO service module with pump-fed main engines and separate RCS/main engine propellant feed system. Equipment-engine section.

Rear toroid housed Igla electronics, with outside diameter of 2.20 m and cross-section diameter 0.35 m.

RCS Coarse No x Thrust: 14 X 98 N. RCS Fine No x Thrust: 4 X 98 N. RCS Coarse Backup No x Thrust: 8 x 10 N. RCS Fine Backup No x Thrust: 4 x 10 N roll. Electric System: 0.50 average kW.

AKA: Priborno-agregatniy otsek.
Gross mass: 2,890 kg (6,370 lb).
Unfuelled mass: 2,390 kg (5,260 lb).
Height: 2.26 m (7.41 ft).
Diameter: 2.15 m (7.05 ft).
Thrust: 4.09 kN (919 lbf).
Specific impulse: 282 s.

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Associated Countries
Associated Spacecraft
  • Soyuz 7KT-OK Russian manned spacecraft. 2 launches, 1971.04.23 (Soyuz 10) to 1971.06.06 (Soyuz 11). This was a modification of Soyuz 7K-OK with a lightweight docking system and a crew transfer tunnel. More...

See also
Associated Propellants
  • Nitric acid/Hydrazine 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. Hydrazine (N2H4) found early use as a fuel, but it was quickly replaced by UDMH. It is still used as a monopropellant for satellite station-keeping motors. More...

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