Space Shuttle main engine ignition.
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Previously:
https://www.homemadetools.net/forum/...703#post151951
https://www.homemadetools.net/forum/...150#post168836
https://www.homemadetools.net/forum/...829#post156240
https://www.homemadetools.net/forum/...3736#post99893
https://www.homemadetools.net/forum/...394#post127209