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This is a 29mm motor. I installed it in an Estes Leviathan for the first ever flight. The rocket was still climbing, maybe two seconds into flight when the top of the rocket blew off and the shock cord was cut or broke in a clean break. There was chairing of the body tube, internally and externally at the nose cone. I estimate that there was no delay grain and it was replaced by an oversize ejection charge. There was a good report like a shotgun going off with this incident.
