I want to post a sad note here.
I didn't have a BB, but my little brother did. We had a little rocket club when I was early teens. He would have been maybe 10 or 11. I built an Orbital Transport, my little brother built a Big Bertha.
When it was time to fly he wanted the C motor, but I wanted it for my OT. I gave him a B motor instead.. because I was the big brother, and a total selfish ass. He even showed me on the label that it needed a C.
My transport flew great, the glider came down everybody cheered. His BB lifted slowly and barely got off the rod. He was so pissed at me. For a long time.
Such was life when we were kids, and now he's gone. He seemed to love me unconditionally anyway over the years. One of my great regrets now.
Sometime along the way I learned to be a better person. I only wish he were still here to see it.