Estes E12-4 Model Rocket Engines with Plugs and Ignitors

Estes E12-4 Model Rocket Engine Assembly How To

E12 Model Rocket Engine Thrust Curve Chart

24mm Rocket Engine Assembly How-to Video

Estes Rockets

E12-4 Engines

$27.99

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.

SKU 010029

Flight Performance

Understand how the E12-4 Engines deliver lift, acceleration, and a smooth flight profile from launch to recovery.

The Estes E12-4 engine delivers impressive power and reliability for your next launch, making it a top choice for rocketeers ready to step up from smaller engines. With a 24mm diameter and 30.00 N-sec of total impulse, this versatile engine provides consistent, exciting flights that never fail to thrill. Whether you’re building new rockets or upgrading existing favorites, the E12-4 offers dependable thrust and excellent performance across a variety of models.

Engineered with precision and designed for excitement, the E12-4 is perfect for upper stage flights but can also be used as a single stage engine. With a strong maximum thrust of 30.60 Newtons and a thrust duration of 2.70 seconds, it strikes the perfect balance between raw lift-off power and sustained acceleration. The 4-second delay adds an ideal pause before ejection, creating smooth, realistic flight sequences that mimic the real thing.

Capable of lifting rockets up to 17 ounces, the E12-4 is an excellent choice for mid-size rockets that need just the right amount of strength to reach soaring altitudes. It’s a versatile addition to your engine collection, giving you flexibility to experiment with different models and flight profiles while ensuring reliable ignition and performance every time you launch.

Each E12-4 engine pack comes with everything you need to get flying quickly, including starters and starter plugs for easy setup. Whether you’re preparing for a weekend launch or stocking up for multiple flights, the Estes E12-4 ensures that every mission begins with the perfect balance of power, timing, and excitement.

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 E12-4 Engines, including impulse, thrust duration, delay, and physical dimensions.

Total Impulse

30.00 N-sec

Time Delay

4 Seconds

Max Lift Weight

17.0 oz. (482 g)

Max Thrust

30.60 Newtons (6.9 lbs)

Thrust Duration

2.70 Seconds

Length

3.8 in. (9.7 cm)

Diameter

24 mm

Weight

2.16 oz. (61.2 g)

Propellant Weight

1.3 oz. (36.9 g)

Choose the Right Rocket

These rockets are designed to fly with the E12-4 Engines for optimal performance and consistent flight results.

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