Power up your mid-size model rockets with the Estes F15-6 Engines. Designed for impressive liftoffs, these 29 mm engines deliver extended thrust for thrilling, high-performance flights. With a 6-second delay, they’re perfect for heavier rockets that require extra coast time before recovery deployment.

The F15-6 offers a total impulse of 49.61 N-sec and a long 3.45-second thrust duration, producing powerful, smooth launches. Whether you’re flying for fun or testing your skills with altitude challenges, this engine gives you the performance needed to push your rockets further into the sky.

Includes:

2 × F15-6 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.

Note: HAZMAT Shipping Restrictions Apply

Take your mid-powered rocket flights to new heights with the Estes F15-6 Engine. This 29 mm engine packs an impressive 49.61 N-sec total impulse and delivers a maximum thrust of 25.26 Newtons—giving your rockets the boost they need for strong, stable launches. It’s ideal for experienced modelers looking for consistent, long-duration thrust and reliable performance across a wide variety of heavier rocket designs.

With a 6-second delay between burnout and recovery deployment, the F15-6 is tailored for mid-size rockets that benefit from longer coast phases. This extended delay allows rockets to climb to higher altitudes before the ejection charge activates, maximizing performance in rockets with slightly heavier payloads or larger airframes. The 3.45-second burn time provides a smooth and powerful push, enhancing flight dynamics and altitude potential.

At 4.5 inches in length and weighing just 3.66 ounces, this engine fits rockets that use 29 mm engine mounts and is especially useful for flights where precise timing and altitude gains are important. It’s a reliable choice for rockets requiring a balance between thrust power and delay timing. The propellant weight of 2.12 ounces ensures you get a high-energy burn for exciting liftoffs and a thrilling flight experience every time.

Whether you’re launching for fun, altitude, or testing your rocketry design skills, the F15-6 delivers a dependable and rewarding launch experience. Pair it with your favorite Estes rocket that calls for an F-engine and enjoy the confidence that comes with top-tier performance and long burn capability.

ATTENTION: Estes Industries, LLC and Echo Six 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 and  Echo Six 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.