Scratch build of my own design I call "Triple A" because I designed it to eat up A8-3 engines from the Estes Blast Off Flight Pack three at a time. This was its first launch; no damage upon recovery despite a rapid descent. Some charring of the joints between fins/body tube right at the bottom of the body tube. No problem. Ignition was with Quest Q2G2 ignitors and a modified Estes controller. I'll have to try it on some B6 engines next...