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edward replied to the topic "Smash Rocketry New Group Project – The Proton M" – 6 years, 1 month ago
54mm is the one size that is more economical to buy the casings. You will get much more interchangeability with drawn 2.125 x .095 wall tubing than you will turning a bunch of pipe for 54mm.That is one reason I… Read more»
