All Estes E12 motors have been discontinued by the manufacturer and are now in final clearance. Estes has issued a service bulletin covering specific production lots of these motors, but also states that “the affected products pose no safety concerns if the National Association of Rocketry safety code guidelines are followed.” Field experience with these motors shows CATO (catastrophic failure) rates in line with what has been observed in recent years.

We are selling through remaining stock on a final, no-warranty basis. These motors are sold “as is,” with no warranty or guarantee from Estes or Denau Hobby Supplies Ltd. By purchasing, you acknowledge and accept the normal risks of model rocketry and agree to follow the National Association of Rocketry (NAR) Safety Code and all applicable safety guidelines.

For full details on the affected lot codes, recommended disposal procedure, and Estes’ store-credit process, please refer to the official Estes E12 Service Bulletin here: https://estesrockets.com/pages/e12-service-bulletin.

The Estes E12-4 is a powerful 24mm engine designed for reliable model rocket flights. With 30.00 N-sec of total impulse and a 4-second delay, it provides a strong, balanced boost for mid-size rockets while ensuring smooth, realistic flight sequences.

Perfect for rockets up to 17 ounces, the E12-4 delivers both power and precision for single stage and upper stage flights. A dependable choice for hobbyists who want excitement, altitude, and consistent performance in every launch.

Includes:

- 2 E12-4 Engines

- 2 Starters

- 4 Starter Plugs