The Estes A8-5 is an 18 mm single-stage model rocket engine designed for lightweight rockets weighing up to 2.0 ounces or 57 grams. Its strong thrust and five-second delay make it well suited for models that benefit from a longer coast period before recovery system deployment.
Each package includes three A8-5 engines, four starters, and four starter plugs, providing the essential ignition components needed for multiple launches with compatible model rocket equipment.
The A8-5 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 five-second delay before ejection. This combination provides quick acceleration followed by an extended coast period for compatible lightweight 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 A8-5 can be used with compatible standard-size model rockets in single-stage or suitable upper-stage applications. Its predictable performance and longer delay make it a practical choice for educational projects, club launches, and recreational flying. 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.
