The picture below of the clay plug over the charge is worse than the end looks, it actually looks perfect, not a bit of the clay plug is warped or blown out etc. It looks perfect. Engine was used on a blue ninja and I fired one other engine from the same pack with no problem. I don't believe I even heard it fire so either it didn't go off, there was no charge to begin with, or it was a very weak undercharge. I wonder if estes would like to have the motor back? Blue ninja fortunately tends to fall horizontally with it's nose cone on so although I figured it would be mashed even after hitting some Kiwi trees it was fine. One pic is of the plugged end, the other is of the thrust end.