Same video, uncompressed from real time t' slow motion, ya bilge rat, and with me shoutin' cut out. Avast! Go t' 12 seconds t' hear t' boom. Blimey! It’s subtle. You can also see a very small disturbance in t' smoke trail at that point. Minimum diameter, usin' a D21-7T, some BT-20 tube t' just hold t' rocket motor and t' nose cone together at t' seam, no more than that, fiberglass fins, a nose cone with heat paint, and some trackin' composition in t' nose cone that didn’t work, it was meant t' go after t' delay, matey, I removed t' ejection grains. Ya scallywag! 1.52 oz. Begad! I can make it lighter weight and probably stubbier, matey, t' composition is dead weight. It has nor recovery system, but I have a multi use one in t' works that uses 1 D21, though I suspect 2 will be needed. Blimey! Yes, arrr, usin' a 24mm E or F motor would be more efficient cross-sectionally with more Ns, but I’m tryin' t' do this with t' smallest motors.