Apollo spacecraft control systems.

The overall Apollo spacecraft configuration includes two separate manned spacecraft. They are the command module designed for earth launch and reentry and cislunar flight including lunar orbit, and the lunar excursion module designed for the excursion from lunar orbit to the moon’s surface and return. Each spacecraft has its own independent guidance and control system. This paper decribes the Apollo spacecraft control systems including engine control and rocket engine configurations for attitude control. The Apollo guidance systems are not discussed.