Charles L Hakes <sally...@gobrainstorm.net> writes: > Yes, not sure if this is the right venue for discussion, but here > goes. I saw the previous message and was too busy at the time to > formulate a reply. Stress data would be useful. I have flown with 3D > printed end caps both successfully and unsuccessfully on rockets up to > 4” in diameter. All of the failures were when something non-nominal > stressed the end caps. (deployment at the wrong time, or a really hard > landing…) I did start adding a metal strip on some rockets for the > through rods and eye bolt to all go through, but I have even done that > on fiberglass. I did not have printed charge wells, but just > suspended the charge in a “balloon.” And copper pipe end caps work > really well for holding charges. The flight and image below is a > "success."
So it sounds to me like both of you are allowing at least some of the load to be carried through the 3d-printed parts? Why? I often use a single piece of all-thread through a bay with a lifting eye on each end such that all the load is carried through the rod, and the composition of the caps is almost irrelevant. I've done the same kind of thing in a tiny airframe with kevlar going all the way through the bay with knots on each end outside the caps to avoid the ebay just sliding loosely on the harness. Bdale
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