We had a good time building this rocket. It was the Estes MIRV. It has one booster engine (c-6-0) that then ignite three individual (1/2a103t) engines. As the first stage boosts the second, the rocket splits into three individual plane/rockets that continue flying under thier own power. Our rocket leaned into the wind and the components ended up in a field with dense growth.....we havent found a single part yet. Everything did function well though and we had a blast doing it.