I am curious if this is completely new tube, or similar to Estes BT-101 (0.021" wall thickness), or LOC 3.9" (0.05" wall thickness).
If it is a 'new tube', just where would it come from?
LOC, Estes. Semroc, etc do not make their tubes they use, and it would cost huge $$ to make a new spec tube that is not already in production.
They came/come from the North Coast* FYI, except for the Phenolic that PML used. That Phenolic company I found out bought the Paper Kraft tube company now... topic for other discussion.
Edit: after some use, the HD 4" tube over a few decades gets closer to .08 in what I put calipers on yesterday
*There is a town in the CLE metro called Euclid...
LOC was born in the CLE metro, Macedonia OH
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