12A3-4T Engines

The Estes 1/2A3-4T engine is a dependable choice for launching lightweight model rockets. Designed as a mini engine with a 13 mm diameter, it delivers a total impulse of 1.25 N-sec and a peak thrust of 8.3 newtons. This quick-thrust, single-stage engine is ideal for smaller rockets that weigh up to 1.0 ounce at liftoff, giving them a powerful and reliable start to flight. With a time delay of 4 seconds before ejection, it allows for stable coasting and safe deployment of recovery systems.

Built with precision for modelers who value consistency, the 1/2A3-4T features a compact size of just 1.8 inches in length and weighs only 0.23 ounces. Despite its small stature, it packs a sharp burst of thrust lasting 0.3 seconds—perfect for short, fast flights in light rocket models. The engine’s performance is tuned to work with Estes’ mini engine-powered kits, providing dependable launches every time.

Each engine pack includes everything needed for multiple launches: four 1/2A3-4T engines, four starters, and four starter plugs. This convenient packaging is ideal for hobbyists who want to enjoy repeat flights without the need for additional components. The included starters and plugs simplify the ignition process, ensuring reliable performance from launch to ejection.

Perfect for beginners and seasoned flyers alike, the Estes 1/2A3-4T engine offers a balanced combination of thrust, delay, and compact power. Whether for hobby flying, educational projects, or flight testing, this engine provides a great entry point into mini-engine rocketry while delivering reliable Estes quality with every launch.

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.