David Meerman Scott

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Marquardt R-4D Apollo spacecraft attitude control engine

Marquardt R-4D Apollo spacecraft attitude control engine The Marquardt R-4D was developed as an attitude control thruster for the Apollo Service Module and Lunar Module. Sixteen engines similar to this one were mounted on the exterior of each lunar module in four quadruple clusters and sixteen on each service module. Because both the lunar module

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Apollo 8 RCA slow scan TV camera training unit

Apollo 8 RCA slow scan TV camera training unit The slow-scan, black-and-white television system used on Apollo 7 and Apollo 8 shot only 10-frames per second with 320 lines of resolution. In comparison, had the American NTSC television standard of 1968 been chosen—525 interlaced lines, 30 frames per second—ten times more bandwidth would have been

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