1/2A3-4T Engines

The Estes 1/2A3-4T engine is a dependable mini engine designed for lightweight model rockets, making it an excellent choice for classroom activities, student launches, and educational flight demonstrations. With a total impulse of 1.25 N-sec and a peak thrust of 8.3 newtons, this 13 mm diameter engine delivers quick-thrust performance that reliably powers rockets weighing up to 1.0 ounce. Its 4-second delay ensures a smooth coasting phase and dependable ejection for safe, successful recoveries.

Ideal for hands-on STEM learning, the 1/2A3-4T engine produces a sharp 0.3-second burst of thrust—perfect for short, controlled flights that reinforce key aerospace concepts. Its reliable performance supports both introductory rocketry lessons and repeat launch exercises, giving educators a trusted option for engaging students in real-world applications of physics and engineering principles.

Each pack includes four 1/2A3-4T engines, four starters, and four starter plugs, providing everything needed for multiple launches in a classroom or group setting. The convenient packaging makes it easy for educators to plan rocket launches without the hassle of sourcing additional ignition components separately.

Backed by Estes’ commitment to quality and safety, the 1/2A3-4T engine is a smart addition to any educational rocketry program. Its consistent performance, compact size, and educator-friendly packaging make it a reliable choice for classroom projects, group activities, and STEM enrichment programs.

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.