Encyclopedia Astronautica
Soyuz ASTP PAO


Russian manned spacecraft module. 4 launches, 1974.04.03 (Cosmos 638) to 1975.07.15 (Soyuz 19 (ASTP)). Soyuz 7K-OK basic PAO service module with pump-fed main engines and separate RCS/main engine propellant feed system. Equipment-engine section.

Structure: 974 kg (2,147 lb). Reaction Control System: 250 kg (550 lb). Navigation Equipment: 30 kg (66 lb). Telemetry Equipment: 50 kg (110 lb). Electrical Equipment: 500 kg (1,100 lb). 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. Spacecraft delta v: 215 m/s (705 ft/sec). Electric System: 8.00 kWh. Electric System: 0.50 average kW.

AKA: Priborno-agregatniy otsek.
Gross mass: 2,654 kg (5,851 lb).
Unfuelled mass: 2,154 kg (4,748 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 7K-TM Russian manned spacecraft. 4 launches, 1974.04.03 (Cosmos 638) to 1975.07.15 (Soyuz 19 (ASTP)). The Soyuz 7K-T as modified for the docking with Apollo. 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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