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I am planning a build that will be MPR/HPR H/I power with LT-125. That's 1.25" ID and 1.34" OD. No coupler material is currently available for that. It's probably possible to cut down some BT-55 coupler (split and reglue). However, I'm pretty sure I have some 1.25" OD, 0.035-wall 6061 tubing sitting in a box in my garage that will likely never get used for anything else. It's strong enough and light enough and the right size without doing any more work except cutting it to length.
We use aluminum for motor cases. Would a 3-inch long section of this tubing used as a coupler/ebay without any pressure containment trespass on the safety code prohibition against metal airframes/nosecones/fins/etc.?
We use aluminum for motor cases. Would a 3-inch long section of this tubing used as a coupler/ebay without any pressure containment trespass on the safety code prohibition against metal airframes/nosecones/fins/etc.?