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 ATTENTION: These engines cannot be sent to post office boxes. Please be sure to provide a PHYSICAL ADDRESS when purchasing E and F sized engines. E and F sized engines cannot be shipped to Alaska, Hawaii, Puerto Rico or Guam.
