The Estes 1/2A3-2T is a single-stage 13mm mini engine for lightweight model rockets. With 1.25 N-s impulse, 8.3 N peak thrust, and a 2-second delay, it delivers quick and reliable launches. Packs include 4 engines, 4 igniters, and 4 plugs.

Ideal for small rockets like Mini Alpha, Mini Bertha, and Mini Honest John, it's perfect for educational, hobbyist, and backyard flying.