The Estes 1/4A3-3T Engine Bulk Pack is built for rocketeers who want more flights, more consistency, and more time in the air. Designed for lightweight model rockets, these mini engines deliver smooth, controlled launches that are perfect for practice flights, backyard sessions, and group launches where reliability matters.

With a full supply ready to go, you can focus on flying instead of rationing engines. The 1/4A3-3T is known for its steady thrust and predictable performance, making it an ideal choice for beginners learning the fundamentals and experienced flyers who want dependable results from smaller builds.

Includes:

24 × 1/4A3-3T Engines

30 × Starters

24 × Starter Plugs

72 × Squares of Recovery Wadding

Total Impulse

0.625 N-sec

Time Delay

3 Seconds

Max Lift Weight

1.0 oz (28 g)

Max Thrust

4.90 Newtons (1.1 lbs)

Thrust Duration 

0.25 Seconds

Length

1.75 in. (4.4 cm)

Diameter

13 mm

Weight

.21 oz. (6 g)

Propellant Weight

0.05 oz (1.3 g)

 SHIPPING INFORMATION: 

Rocket Engines will be shipped ground UPS  2 - 5 day service at no extra charge.

Estes model rocketry is recommended for ages 10 and up with adult supervision for those under 12. Unless otherwise specified, all models require assembly. Tools, construction and finishing supplies sold separately. In order to launch, a launch system, model rocket engines, starters and recovery wadding are required - sold separately-unless otherwise specified.