Launch lugs are used to guide a rocket until it reaches a speed where the fins can take over. Most kits come with launch lugs, but a small straw will work just fine as a replacement . A stand-off is sometimes used to keep the launch rod from interfering with a larger diameter section.
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When designing your own rocket, it is best to center the launch lug over the center of gravity.
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Nicholas Burlett, Nathaniel Grady and William