The Estes A3-4T Flight Pack is designed for lightweight model rockets that use 13 mm mini engines. The A3-4T provides a quick boost followed by a four-second delay, making it well suited for small, streamlined rockets that benefit from a short powered ascent and predictable recovery system deployment.
Each flight pack includes four A3-4T engines, four starters, four starter plugs, and twelve sheets of recovery wadding. The included components provide a convenient setup for multiple launches without requiring ignition and recovery supplies to be purchased separately.
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. The engine is rated for rockets with a maximum lift weight of 2.0 ounces or 57 grams.
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 Flight Pack is a practical choice for compatible mini-engine model rockets, educational projects, hobby launches, and repeated flights where compact size and consistent performance are important. 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.
