A3-4T Engine Flight Pack

The Estes A3-4T Flight Pack delivers a balanced combination of performance and control, making it an excellent option for lightweight model rockets. With a total impulse of 2.50 N-sec and a 4-second delay, the A3-4T is ideal for small, streamlined rockets needing a gentle but reliable boost. Its short thrust duration of 0.6 seconds provides a quick lift-off while leaving plenty of time for a safe recovery sequence. This engine can lift rockets weighing up to 2.0 oz (57 g), making it best suited for mini engine-powered models with 13mm engine mounts. It reaches impressive speeds and altitudes with a max thrust of 6.8 newtons, delivering a strong initial push before handing off to recovery deployment. The 4-second time delay offers sufficient coasting time for many light rockets before the ejection charge fires. The compact design—just 1.8 inches in length and weighing only 0.28 oz—ensures a perfect fit in small model rockets where space and mass efficiency are critical. Despite its small size, the A3-4T engine packs a dependable performance punch, thanks to Estes’ precise engineering and safety-tested reliability. Each A3-4T Flight Pack comes complete with four A3-4T engines, four starters, four starter plugs, and twelve sheets of recovery wadding. It’s everything you need to keep your low-weight rockets flying smoothly and safely time after time. 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.