Rocket Engine Overview: The Estes 1/2A6-2 Bagged Rocket Engines are reliable eighteen-millimeter single-stage engines designed for lightweight model rockets weighing under two ounces. These engines offer a great combination of manageable power and performance, making them ideal for smaller rockets or beginner-level flights. About the Rocket Engines Smooth Performance Delivering a total of 1.25 Newton-seconds (N-s) and a maximum thrust of 8.9 Newtons (N), the 1/2A6-2 provides a controlled ascent with a two-second delay before ejection. This balance of power and timing helps rockets achieve stable flight and safe recovery. It's an excellent choice for educational settings, casual launches, or anyone looking to enjoy dependable low-altitude flights. Features: Designed for model rockets weighing less than two ounces Eighteen-millimeter size fits most standard engine mounts Two-second delay for ejection timing Ideal for low-altitude, controlled flights Includes: (3) 1/2A6-2 Bagged Rocket Engines (4) Starters (4) Starter Plugs