1/2A3-4T Model Rocket Engines, (4pk)

The Estes 1/2A3-4T engine is a mini, single-stage engine built for lightweight model rockets up to 1.0 ounce. With a total impulse of 1.25 N-sec, a maximum thrust of 8.3 newtons, and a brief 0.3-second thrust duration, it’s designed for quick, reliable flights in smaller models.

Each 1/2A3-4T engine pack includes four engines, four starters, and four starter plugs, providing hobbyists with the essentials for multiple launches. Its compact size and dependable performance make it an ideal choice for hobbyists and educators seeking a reliable mini engine option.

Includes:

4 × 1/2A3-4T Engines

4 × Starters

4 × Starter Plugs

PLEASE NOTE: You must have a physical address for delivery.

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 and Echo Six LLCrequires 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 and Echo Six 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.