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hold-down arm


'hold-down arm' can also refer to...

 

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A device that restrains a rocket as it begins to fire on the launch pad, automatically releasing it at lift-off. The Saturn V rocket required four hold-down arms on its mobile launcher during assembly, transportation to the launch site, and positioning on the launch pad. Each arm had to sustain a vertical thrust of 725 800 kg.

Subjects: Astronomy and Astrophysics.


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