Encyclopedia Astronautica
Soyuz A PAO


Russian manned spacecraft module. Study 1962. Soyuz 7K-OK basic PAO service module with pump-fed main engines and separate RCS/main engine propellant feed system but with no base flange for a shroud. Equipment-engine section.

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: 2,400 kg (5,200 lb).
Unfuelled mass: 1,570 kg (3,460 lb).
Height: 2.10 m (6.80 ft).
Diameter: 2.30 m (7.50 ft).
Thrust: 4.09 kN (919 lbf).
Specific impulse: 282 s.

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Associated Countries
Associated Spacecraft
  • Soyuz A Russian manned spacecraft. Study 1962. The 7K Soyuz spacecraft was initially designed for rendezvous and docking operations in near earth orbit, leading to piloted circumlunar flight. More...

Associated Engines
  • KTDU-35 Isayev Nitric acid/UDMH rocket engine. 4.09 kN. Out of Production. Isp=280s. Soyuz, Salyut 4 maneuvering engine. KTDU-53 version in L-1 circumlunar spacecraft; KTDU-66 in Salyut 1 space station. Thrusts 4.09 kN main + 4.03 kN secondary. First flight 1966. 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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