I'm getting conflicting information with regards to booster motors, such as the Estes C6-0. Do they have no ejection charge at all? Or do they have an ejection charge that will ignite immediately after the propulsion is over with? Specifically, does the C6-0 motor kick backwards at the end, or not? My goal here is to add 4 motors around a central one in a 1:100 Saturn V with a custom cluster mount. If the C6-0's do not have an ejection charge and kickback, then it should be ok for the central one to burn for a longer time. If however, there's a pop opposing the central thrust, I don't know what's going to happen, and I'd rather my rocket not be the Guinea pig.