12A3-2T Engines

The Estes 1/2A3‑2T engine is a single-stage mini engine designed specifically for lightweight model rockets, especially those built on BT-5 (13 mm) airframes. Ideal for backyard launches or small-field use, this engine delivers a dependable lift-off experience for smaller, beginner rockets. Each pack includes four motors, four igniters, and four starter plugs—ready for multiple launches right out of the box.

Offering a total impulse of 1.25 N‑s, peak thrust of approximately 8.3 N (1.9 lb), and a short thrust duration of 0.30 s, the 1/2A3‑2T provides a quick and spirited liftoff without overtaxing lightweight models. Following burnout, a 2-second delay gives your rocket time to coast to apogee before deploying its recovery system, minimizing stress on both rocket and engine.

Compact yet powerful, this 13 mm engine measures 1.75″ in length, weighs just 0.23 oz (6.5 g), and contains 0.07 oz (1.9 g) of propellant. Its size and energy make it a perfect match for mini rockets like the Mini Alpha™, Mini Bertha™, Mini Der Red Max™, Mini Mod™, and Mini Honest John™.

Whether used in educational settings, STEM programs, or hobbyist launches at home, the 1/2A3‑2T offers consistent and reliable performance. Built to Estes’ high standards, it’s a trusted engine for rocketeers who prioritize simplicity, repeatability, and fun in small-package launches.

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.