This NASA film from 1962 shows an early version of the Apollo lunar mission concept. Some interesting minor differences from the final design include the mechanical arms used to reorient the lunar module and the ladder astronauts would use to climb down to the lunar surface.

One notable difference: the Apollo command module was intended to touchdown on land rather than at sea. Shock absorbers would have added considerable weight, however. The final design of the capsule could not safely touchdown on land; the impact would have severely injured the crew members. Broken backs were a likely outcome. As a result, one of the launch constraints on Apollo missions was wind direction. The wind had to be in a direction that would carry the command module out to sea, rather than back toward land, in the event of a launch abort.

Written by Astro1 on January 11th, 2015 , Space History

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