Same video, me hearties, uncompressed from real time t' slow motion, and with me shoutin' cut out. Arrr! Blimey! Go t' 12 seconds t' hear t' boom. It’s subtle. You can also see a very small disturbance in t' smoke trail at that point. Avast! Blimey! 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, I removed t' ejection grains. 1.52 oz. Avast, me proud beauty! Blimey! I can make it lighter weight and probably stubbier, t' composition is dead weight. Aye aye! Blimey! 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. Arrr! Blimey! Yes, shiver me timbers, usin' a 24mm E or F motor would be more efficient cross-sectionally with more Ns, matey, but I’m tryin' t' do this with t' smallest motors.