1/2A3 Model Rocket Engine Thrust Curve Chart

Estes Rockets

1/2A3-4T Engine Bulk Pack

$99.99

The Estes 1/2A3-4T Engine Bulk Pack delivers reliable power for mini rockets, making it a favorite for classrooms, youth groups, and clubs. Perfect for smaller models like the Star Hopper, these engines provide consistent performance and exciting flights that everyone can enjoy.

Convenient and cost-effective, bulk packs include everything you need to launch 24 rockets. With Estes, you’ll have the quality and dependability trusted by rocketeers for decades.

Includes:: 1 × /2A3-4T Engines; 30 × Starters; 24 × Starter Plugs; 75 × Squares of Recovery Wadding

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

SKU 001788

Flight Performance

Understand how the 1/2A3-4T Engines deliver lift, acceleration, and a smooth flight profile from launch to recovery.

The Estes 1/2A3-4T Engine Bulk Pack is designed for rocketeers who love launching mini rockets with maximum fun. This 1/2A impulse engine is small but mighty, delivering exciting flights that are perfect for beginners and groups who want to see their rockets soar while still staying within a visible flight path.

Despite being a mini engine, the 1/2A3-4T packs plenty of power and offers reliable performance. It’s an excellent choice for younger rocketeers or group activities where keeping rockets in sight makes launches more engaging and manageable. Estes engines are precision manufactured for consistent results, giving you peace of mind with every countdown.

Bulk packs are a smart way to prepare for group launches or multiple flights in one session. Each pack comes with all the essentials you’ll need for 24 launches, including engines, starters, plugs, and recovery wadding. With everything in one place, you’ll spend less time gathering supplies and more time enjoying launches.

Whether you’re flying the Star Hopper bulk pack rockets or other compatible Estes mini-engine models, the 1/2A3-4T Engine Bulk Pack ensures smooth, safe, and exciting flights. From classrooms to rocket clubs, this pack is the perfect companion for rocketry adventures big and small.

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 1/2A3-4T Engines, including impulse, thrust duration, delay, and physical dimensions.

Total Impulse

1.25 N-sec

Time Delay

4 Seconds

Max Lift Weight

1.0 oz. (28 g)

Max Thrust

8.30 Newtons (1.9 lbs)

Thrust Duration

0.30 Seconds

Length

1.8 in. (4.6 cm)

Diameter

13 mm

Weight

0.23 oz. (6.5 g)

Propellant Weight

0.07 oz. (1.9 g)

Choose the Right Rocket

These rockets are designed to fly with the 1/2A3-4T Engines for optimal performance and consistent flight results.

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