Actually, the main tube is super strong; it's double walled along it's entire length. 36" x 24mm thick walled tubes on the outside and staggered full length (36") coupler tubes on the inside, glued together by an epoxy layer. Absolutely no flex if I hold the fully loaded rocket in the center and give it a vigorous "bounce" test.Wow, that rocket zipped off the pad - kinda surprised me! Hope it didn't buckle the tube right in front of the engine. Great job!
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