I will be bringing several cardboard tubes to the launch this Saturday. They were used for bolts of fabric and were given to me. They range from 36" to 43" long, 1 to 2.25" in diameter, and varying wall thickness. A couple have kinks in them but other than that they are in pretty good shape. I'll leave them by the launch table (if OK with Bill and Ken). First-come-first-serve. If people are like them, I should be able to bring more from time-to-time.
I'll be launching a tube fin rocket made from one of the tubes on Saturday. So, we'll get to see just how good they are!
Claude