Estes A3-4T Model Rocket Engine Flight Pack

Estes A3-4T Engine Flight Pack with Plugs, Ignitors, and Recovery Wadding

Estes A3-4T Rocket Engine Flight Pack Assembly

A3 Model Rocket Engine Thrust Curve Chart

Estes 13mm Model Rocket Engine Assembly How-To Video

Estes Rockets

A3-4T Engine Flight Pack

$13.99

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.

Includes:: 4 × A3-4T Engines; 4 × Starters; 4 × Starter Plugs; 12 × Sheets of Recovery Wadding

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

SKU 010058

Flight Performance

Understand how the A3-4T Engines deliver lift, acceleration, and a smooth flight profile from launch to recovery.

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.

Technical Specifications

Review the full specifications for the A3-4T Engines, including impulse, thrust duration, delay, and physical dimensions.

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)

Choose the Right Rocket

These rockets are designed to fly with the A3-4T Engines for optimal performance and consistent flight results.

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