Russian manned spacecraft module. One launch, 1976.09.15, Soyuz 22. Soyuz 7K-OK basic PAO service module with pump-fed main engines and separate RCS/main engine propellant feed system. 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.
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Gross mass: 2,610 kg (5,750 lb).
Unfuelled mass: 2,110 kg (4,650 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.
Soyuz 7K-MF6 Russian manned spacecraft. One launch, 1976.09.15, Soyuz 22. Soyuz 7K-T modified with installation of East German MF6 multispectral camera. Used for a unique solo Soyuz earth resources mission. More...
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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