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