E12-4 Standard Engines for Model Rockets (3) (EST10029)

The Estes E12-4 is a 24 mm model rocket engine designed for compatible mid-size rockets weighing up to 17.0 ounces or 482 grams. Its strong thrust and four-second delay provide a balanced flight profile with sustained acceleration followed by a moderate coast period before recovery system deployment.

Each package includes two E12-4 engines, two starters, and four starter plugs, providing the essential ignition components needed for multiple launches with compatible model rocket equipment.

The E12-4 delivers a total impulse of 30.00 N-sec with a maximum thrust of 30.60 Newtons or 6.9 pounds. Its thrust duration is approximately 2.70 seconds, followed by a four-second delay before ejection. This combination provides dependable lift and predictable recovery timing for compatible rockets.

Each engine measures approximately 3.8 inches or 9.7 centimeters long and has a 24 mm diameter. The engine weighs approximately 2.16 ounces or 61.2 grams and contains approximately 1.3 ounces or 36.9 grams of propellant.

The E12-4 is a practical choice for compatible single-stage rockets and suitable upper-stage applications that require strong, sustained thrust and a moderate delay before recovery deployment. Always verify the rocket manufacturer's recommended engine configuration before use.

Purchasers and users of Estes model rocket engines are responsible for following all applicable local, state, and federal laws, regulations, and safety standards. Model rocket engines must be handled and used only as intended and in accordance with established model rocketry safety practices. Estes Industries, LLC disclaims liability for personal injury, property damage, or other loss resulting from misuse, improper handling, or unauthorized use of its model rocket engines.