D12-3 Engines

The Estes D12-3 Engine is a powerful tool for launching hands-on learning to new heights. Designed for use with mid-size model rockets, the D12-3 is ideal for educational environments where reliable flight performance and controlled recovery are essential. With a 3-second delay before ejection, these engines are well-suited for heavier rockets or those carrying payloads such as altimeters, egg capsules, or classroom-designed experiments.

Educators benefit from the predictable performance of the D12-3, which supports physics, engineering, and aerospace curriculum with real-world application. The shorter delay timing ensures recovery systems deploy closer to peak altitude, minimizing drift and simplifying rocket retrieval—especially helpful in schoolyards, athletic fields, or designated recovery areas.

Each pack contains 2 engines, along with 4 igniters and 4 igniter plugs, offering enough materials for two full launches and backups. Estes engines are manufactured to strict quality standards, providing a safe and consistent classroom experience. They’re a dependable choice for middle school, high school, and collegiate-level programs focused on rocketry and STEM engagement.

Whether you’re leading a classroom rocket challenge or supporting an after-school STEM club, the D12-3 gives students the power to explore Newton’s Laws, thrust-to-weight ratios, and safe recovery systems. It's a trusted engine for bringing aerospace concepts to life in hands-on, memorable ways.

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.