• Package of Estes A3-4T model rocket engines with four engines visible inside a sealed blue and black bag, showing usage instructions and safety warnings.
  • Four cylindrical model rocket engines labeled A3-4T displayed next to their blue and black packaging with safety warnings, against a black background.
  • Five cylindrical model rocket engines with brown paper casings labeled with green text indicating Estes A3-4T single-stage rocket motors arranged closely together on a white background.
  • Set of four ESTES A3-4T Engines for model rockets, shown with ignitors and plugs, designed for STEM learning and hobby enthusiasts supporting hands-on educational projects.
  • Graph showing thrust curve over time in seconds for the ESTES A3-4T Engines, highlighting thrust in newtons with peak performance under 4 seconds, supporting STEM learning.
  • Graph illustrating the thrust curve of ESTES A3-4T Engines, showing maximum thrust, propellant burnout, delay period with no measurable thrust, and activation of the ejection charge over time.
  • Close-up of hands assembling a component of ESTES A3-4T Engines rocket engine on a green cutting mat, highlighting detailed craftsmanship and STEM-focused learning.
  • ESTES A3-4T Engines
Estes Rockets

ESTES A3-4T Engines

$16.99
$16.99
Sale Sold out
Shipping calculated at checkout.

The Estes A3-4T is a mini single-stage engine built for rockets up to 2.0 ounces—ideal for hobby and specialty retail. With a peak thrust of 6.80 newtons and a 4-second delay, it delivers consistent performance for lightweight rocket flights.

Each retail pack includes four engines, four starters, and four starter plugs—offering a convenient, all-in-one engine option for customers seeking dependable Estes quality.

Includes:
- 4 A3-4T Engines
- 4 Starters
- 4 Starter Plugs

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

Overview

The Estes A3-4T engine is a mini single-stage model rocket engine designed for lightweight rockets, making it a valuable addition to any retail model rocketry lineup. With a total impulse of 2.50 N-sec and a peak thrust of 6.80 newtons (1.5 lbs), this 13 mm diameter engine delivers consistent, reliable performance for rockets up to 2.0 ounces (57 g). The 4-second delay before ejection provides hobbyists with dependable recovery system deployment and stable flight paths.

With a thrust duration of 0.60 seconds, the A3-4T is ideal for rockets requiring moderate thrust and a longer coast phase before ejection. Its predictable performance and proven reliability make it a popular choice among model rocketeers, offering retailers a strong-selling option for customers flying lightweight rockets with mini engines.

Each retail pack contains four A3-4T engines, four starters, and four starter plugs—providing a complete launch solution for consumers. The inclusion of starters and plugs simplifies purchasing and makes these packs an easy choice for hobby shops looking to offer all-in-one solutions on their shelves. With trusted Estes quality, these retail-ready packs support both individual sales and repeat purchases.

The A3-4T engine’s balanced thrust, consistent performance, and convenient packaging make it a reliable, high-turn product for retailers stocking model rocketry essentials. Backed by Estes’ reputation for quality, it’s a proven engine choice that supports customer satisfaction and store loyalty.

ATTENTION: Estes Industries, LLCand Echo Six 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 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.


Technical Specifications:
Total Impulse:
2.50 N-sec
Length:
1.8 in. (4.6 cm)
Time Delay:
4 Seconds
Diameter:
13 mm
Max Lift Weight:
2.0 oz. (57 g)
Weight:
.28 oz. (7.9 g)
Max Thrust:
6.80 Newtons (1.5 lbs)
Propellant Weight:
0.12 oz. (3.3 g)
Thrust Duration:
0.60 Seconds

Compatible Rockets:

Star Hopper™
Space Corps™ Lunar Scout™
Mini Honest John

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C
Clay Davis
Just what I needed.

When these where sold out everywhere Echo Six came through, Got them in time for my cub scout event.

We are always standing by for the Scouting STEM events. I'm glad we could help you and you Cub Scouts Mr. Davis.