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Estes F15-4 Rocket Motors Plugs and Ignitors

F15 Model Rocket Engine Thrust Curve Chart

Estes Rockets

F15-4 Engines (29 mm)

$33.99

The Estes F15-4 engine delivers high-thrust power and long burn times, making it a reliable choice for mid-power rockets. With a 4-second delay, it’s optimized for heavier, single-stage rockets needing a smooth boost-to-deploy transition.

Built for performance, the F15-4’s extended 3.45-second thrust duration provides impressive altitude gains, while the 29 mm casing ensures compatibility with a wide range of larger rockets. It’s an ideal choice for modelers ready to step up from D and E engines.

Includes:: 2 × F15-4 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 010031

Flight Performance

Understand how the F15-4 Engines deliver lift, acceleration, and a smooth flight profile from launch to recovery.

Take your flights to the next level with the Estes F15-4 engine, a powerful mid-power engine designed for model rocket enthusiasts seeking longer thrust duration and higher lift capabilities. With 49.61 N-sec of total impulse and a max thrust of 25.26 Newtons, this engine is built to launch heavier rockets to stunning altitudes with confidence and control.

The F15-4 offers more than just raw power, it’s engineered for dependable, sustained flight. The 4-second delay provides a balanced coast period after burnout, ideal for deploying parachutes or other recovery systems at peak altitude. Its long 3.45-second thrust duration gives your rocket a smooth, graceful ascent, minimizing stress on airframes while maximizing trajectory efficiency.

This engine is a popular choice for larger rockets in the Estes Pro Series II line and other compatible 29 mm models. Its consistent performance makes it an excellent pick for hobbyists looking to upgrade from E-class engines while staying within the ease of single-use, black powder propulsion. Whether you're launching for sport, altitude records, or payload testing, the F15-4 delivers dependable performance every time.

With its powerful thrust profile, long burn, and mid-delay deployment, the Estes F15-4 is perfect for high-performance rockets weighing up to 21 ounces. Expand your launch capabilities and experience the next level of model rocketry excitement with this hard-working engine.

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 F15-4 Engines, including impulse, thrust duration, delay, and physical dimensions.

Total Impulse

49.61 N-sec

Time Delay

4 Seconds

Max Lift Weight

21.0 oz. (595 g)

Max Thrust

25.26 Newtons (5.7 lbs)

Thrust Duration

3.45 Seconds

Length

4.5 in. (11.4 cm)

Diameter

29 mm

Weight

3.59 oz. (101.8 g)

Propellant Weight

2.12 oz. (60.0 g)

Choose the Right Rocket

These rockets are designed to fly with the F15-4 Engines for optimal performance and consistent flight results.

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F15-4 Engines (29 mm)

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F15-4 Engines (29 mm)