1/4A3-3T Engine Bulk Pack

The Estes 1/4A3-3T Engine Bulk Pack is a practical choice for educators and youth program leaders who need reliable mini engines for lightweight model rocket launches. Built for small rockets, the 1/4A3-3T delivers controlled performance that helps keep flights approachable, repeatable, and easy for students to follow from liftoff through recovery.

Consistency is what makes this engine especially useful in educational settings. When students are learning the basics of model rocketry, predictable engine performance helps them connect what they build with what they observe in flight. The 1/4A3-3T provides a steady, dependable boost, making it easier to compare rocket designs, discuss flight results, and reinforce core STEM concepts through hands-on experience.

With a total impulse of 0.625 N sec, a 3 second delay, and a maximum lift weight of 1.0 oz, this engine is designed for lightweight rockets that benefit from a gentle boost and reliable recovery timing. Its compact 13 mm size makes it well suited for small model rockets used in demonstrations, group activities, and beginner-friendly launch experiences.

Having a bulk pack on hand helps make launch day smoother from start to finish. Whether you are supporting a classroom activity, camp program, scout group, or youth rocketry event, the 1/4A3-3T gives you the dependable mini engine performance you need to keep students engaged and excited about learning. Always follow Estes safety guidelines and local launch regulations.

ATTENTION: Estes Industries, LLC requires all purchasers and users of Estes® Model Rocket Engines to adhere strictly to all applicable local, state, and federal laws, regulations, and safety standards. The user assumes all responsibility for the safe and lawful use of Estes® products. Estes Industries, LLC expressly disclaims any and all liability for personal injury, property damage, or other loss resulting from the misuse, improper handling, or unauthorized application of its model rocket engines.