1/4A3-3T 13mm Engines for Model Rockets (4) (EST10010)

The Estes 1/4A3-3T is a compact 13 mm single-stage model rocket engine designed for lightweight rockets weighing up to 1.0 ounce or 28 grams. Its gentle thrust profile and three-second delay make it well suited for training flights, educational projects, and small-model launches where predictable performance and easy recovery are important.

Each package includes four 1/4A3-3T engines, four starters, and four starter plugs, providing the essential ignition components needed for multiple launches with compatible model rocket equipment.

The 1/4A3-3T delivers a total impulse of 0.625 N-sec with a maximum thrust of 4.90 Newtons or 1.1 pounds. Its thrust duration is approximately 0.25 seconds, followed by a three-second delay before ejection. This combination provides a brief, controlled boost followed by a short coast period before recovery system deployment.

Each engine measures approximately 1.75 inches or 4.4 centimeters long and has a 13 mm diameter. The engine weighs approximately 0.21 ounces or 6 grams and contains approximately 0.05 ounces or 1.3 grams of propellant.

The 1/4A3-3T is a practical choice for compatible mini model rockets, classroom activities, beginner flying, and lightweight custom builds. Its modest power and consistent performance make it especially useful for smaller rockets designed for lower-altitude flights. 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.