F15-4 Engines (29 mm)

Enhance your STEM curriculum with the Estes F15-4 engine—an ideal mid-power motor for launching larger or more advanced model rockets in educational settings. Delivering 49.61 N-sec of total impulse and a strong 3.45-second thrust duration, the F15-4 supports heavier rockets and enables longer, more dramatic flights that captivate students’ attention.

This engine features a 4-second delay, offering a controlled coast period that aids in illustrating the physics of flight and optimal parachute deployment timing. Its 29 mm diameter and black powder construction make it easy to integrate into advanced classroom builds without requiring high-power certifications or specialized equipment.

For educators running enrichment programs, science camps, or high school-level rocketry units, the F15-4 provides an exciting step up from standard classroom engines. It’s a great fit for demonstrating Newton’s Laws, force and motion principles, and the role of thrust duration and delay in flight planning.

Each pack includes 2 engines, 2 starters, and 4 starter plugs—convenient for group use or multi-day projects. With the Estes F15-4, students can experience mid-power rocketry in a safe, accessible way while expanding their understanding of STEM concepts through real-world application.

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.