The Estes A3-4T is a compact 13 mm single-stage model rocket engine designed for lightweight rockets weighing up to 2.0 ounces or 57 grams. Its moderate thrust and four-second delay make it well suited for mini rockets that benefit from a longer coast period before recovery system deployment.
Each package includes four A3-4T engines, four starters, and four starter plugs, providing the essential ignition components needed for multiple launches with compatible model rocket equipment.
The A3-4T delivers a total impulse of 2.50 N-sec with a maximum thrust of 6.80 Newtons or 1.5 pounds. Its thrust duration is approximately 0.60 seconds, followed by a four-second delay before ejection. This combination provides predictable acceleration and timing for compatible lightweight models.
Each engine measures approximately 1.8 inches or 4.6 centimeters long and has a 13 mm diameter. The engine weighs approximately 0.28 ounces or 7.9 grams and contains approximately 0.12 ounces or 3.3 grams of propellant.
The A3-4T is a practical choice for compatible mini model rockets, hobby launches, educational projects, and repeated single-stage flights. Its compact size, balanced thrust, and consistent delay make it suitable 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.
