Encyclopedia Astronautica
Apollo Direct SM


American manned spacecraft module. Study 1961. The Service Module housed the fuel cells, environmental control, and other major equipment items required for the mission.

It also provided the propulsion requirements for lunar launch through transearth midcourse corrections. The same basic engine would used as on the terminal landing module with the throttling feature removed and a radiation cooled skirt added to provide an expansion ratio of 40:1.

Gross mass: 10,624 kg (23,421 lb).
Unfuelled mass: 1,784 kg (3,933 lb).
Payload: 520 kg (1,140 lb).
Height: 2.60 m (8.50 ft).
Diameter: 2.85 m (9.35 ft).

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Associated Countries
Associated Spacecraft
  • Apollo Direct 2-Man American manned lunar lander. Study 1961. A direct lunar lander design of 1961, capable of being launched to the moon in a single Saturn V launch through use of a 75% scale 2-man Apollo command module. More...
  • Gemini Lunar Lander American manned lunar lander. Study 1961. A direct lunar lander design of 1961, capable of being launched to the moon in a single Saturn V launch through use of a 2-man Gemini re-entry vehicle instead of the 3-man Apollo capsule. More...

See also
Associated Manufacturers and Agencies
  • NASA American agency overseeing development of rockets and spacecraft. National Aeronautics and Space Administration, USA, USA. More...
  • McDonnell American manufacturer of spacecraft. McDonnell, St Louis, USA. More...

Associated Propellants
  • N2O4/MMH Nitrogen tetroxide became the storable liquid propellant of choice from the late 1950's. Monomethylhydrazine (CH3NHNH2) is a storable liquid fuel that found favour in the United States for use in orbital spacecraft engines. Its advantages in comparison to UDMH are higher density and slightly higher performance. More...

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