Encyclopedia Astronautica
Big Gemini AM


American manned spacecraft module. Reached mockup stage 1967. Earth orbit maneuver and retrofire.

RCS Coarse No x Thrust: 16 x 440 N. RCS specific imulse: 273 sec. Spacecraft delta v: 350 m/s (1,140 ft/sec).

AKA: Adapter Module.
Gross mass: 4,450 kg (9,810 lb).
Height: 1.60 m (5.20 ft).
Diameter: 4.27 m (14.00 ft).

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Associated Countries
Associated Spacecraft
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Associated Propellants
  • N2O4/UDMH Nitrogen tetroxide became the storable liquid propellant of choice from the late 1950's. Unsymmetrical Dimethylhydrazine ((CH3)2NNH2) became the storable liquid fuel of choice by the mid-1950's. Development of UDMH in the Soviet Union began in 1949. It is used in virtually all storable liquid rocket engines except for some orbital manoeuvring engines in the United States, where MMH has been preferred due to a slightly higher density and performance. More...

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