The Estes A8-3 is an 18 mm single-stage model rocket engine designed for lightweight rockets weighing up to 3.0 ounces or 85 grams. Its steady thrust and three-second delay provide a balanced flight profile that is well suited for beginner models, classroom demonstrations, youth group activities, and everyday hobby launches.
Each package includes three A8-3 engines, four starters, and four starter plugs, providing the essential ignition components needed for multiple launches with compatible model rocket equipment.
The A8-3 delivers a total impulse of 2.50 N-sec with a maximum thrust of 10.70 Newtons or 2.4 pounds. Its thrust duration is approximately 0.80 seconds, followed by a three-second delay before ejection. This combination provides a smooth boost, a short coast period, and dependable recovery system deployment for compatible rockets.
Each engine measures approximately 2.8 inches or 7 centimeters long and has an 18 mm diameter. The engine weighs approximately 0.55 ounces or 15.6 grams and contains approximately 0.14 ounces or 4.1 grams of propellant.
The A8-3 is a practical choice for compatible standard-size model rockets and is suitable for educational rocketry, STEM programs, camps, clubs, and recreational flying. Its predictable performance makes it useful for both beginning and experienced rocketeers. Always verify the rocket manufacturer's recommended engine configuration before use.
Purchasers and users of Estes model rocket engines are responsible for following all applicable local, state, and federal laws, regulations, and safety standards. Model rocket engines must be handled and used only as intended and in accordance with established model rocketry safety practices. Estes Industries, LLC disclaims liability for personal injury, property damage, or other loss resulting from misuse, improper handling, or unauthorized use of its model rocket engines.
