C6-5 Engine Bulk PackInspire your students with powerful and reliable rocket flights using the Estes C6 5 Engine Bulk Pack. As one of our most popular classroom engines, the C6 5 delivers impressive altitude and performance while keeping launches safe, predictable, and fun. With strong thrust and a steady five second delay, it offers a perfect mix of excitement and educational value for all types of rocketry lessons. Designed for rockets weighing under four ounces, the C6