The Estes 1/2A3-4T is a compact 13 mm single-stage model rocket engine designed for lightweight rockets weighing up to 1.0 ounce or 28 grams. Its quick thrust profile and four-second delay make it well suited for smaller models that need a short burst of acceleration followed by a stable coast before recovery system deployment.
Each package includes four 1/2A3-4T engines, four starters, and four starter plugs, providing the essential components needed for multiple launches with compatible model rocket equipment.
The 1/2A3-4T delivers a total impulse of 1.25 N-sec with a maximum thrust of 8.30 Newtons or 1.9 pounds. Its thrust duration is approximately 0.30 seconds, followed by a four-second delay before ejection. This combination provides predictable performance for compatible lightweight mini rockets.
Each engine measures approximately 1.8 inches or 4.6 centimeters long and has a 13 mm diameter. The engine weighs approximately 0.23 ounces or 6.5 grams and contains approximately 0.07 ounces or 1.9 grams of propellant.
The 1/2A3-4T is a practical choice for hobby flying, educational projects, flight testing, and other applications using compatible mini-engine model rockets. Its compact size and consistent performance 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.
