Hi everyone. I went to a launch last weekend and had a motor mishap that really baffles me. I was flying a Binder Design California Kid on a CTI J195 19. It is a 2 grain motor. I had it in a 3 grain case with a spacer. Everything seemed normal, after the countdown, it seemed to start to ignite, then boom the upper half of this dual-deploy airframe shot 20 some feet into the air, while the lower half stayed on the launch rail. When I went to inspect I found that the forward end of the motor casing had expanded so that the motor spacer had shot out of the casing. The lower body tube was torn into pieces. The aft end of the E-bay had crumpled, but, neither deployment charge had exploded. You are probably thinking the motor over pressurized, but the thing that doesn't make sense is that the propellant did not burn at all. Both grains looked brand new. I wish I had taken pics, but the vender took the motor back to return it to CTI. Any ideas Rocketry Forum?