We had a good time buildin' this rocket. It was t' Estes MIRV. Ahoy! It has one booster engine (c-6-0) that then ignite three individual (1/2a103t) engines. As t' first stage boosts t' second, t' rocket splits into three individual plane/rockets that continue flyin' under thier own power. Our rocket leaned into t' wind and t' components ended up in a field with dense growth.....we havent found a single part yet. Everythin' did function well though and we had a blast doin' it.