The Estes A3-4T Flight Pack is designed for small, lightweight model rockets requiring 13mm mini engines. With a 2.50 N-sec total impulse, a 4-second delay, and a thrust duration of just 0.6 seconds, this engine delivers quick, efficient liftoffs followed by reliable deployment timing.
Each flight pack includes 4 A3-4T engines, 4 starters, 4 plugs, and 12 sheets of recovery wadding, making it a complete solution for rocketeers looking for consistent mini engine performance in every launch.
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.
Total Impulse: 2.50 N-sec
Time Delay: 4 Seconds
Max Lift Weight: 2.0 oz. (57 g)
Max Thrust: 6.80 Newtons (1.5 lbs)
Thrust Duration : 0.60 Seconds
Length: 1.8 in. (4.6 cm)
Diameter: 13 mm
Weight: 0.28 oz. (7.9 g)
Propellant Weight: 0.12 oz. (3.3 g)
