C11-5 Engines

The Estes C11-5 engine is designed to help educators bring deeper STEM learning to life in the classroom or on the launch field. With a total impulse of 10.00 N-sec and a 24 mm diameter, this single-stage engine delivers the performance needed for mid-sized model rockets while keeping complexity appropriate for student use. It’s an ideal choice for middle and high school students ready to progress beyond A, B, and standard C motors.

The C11-5 features a 0.80-second thrust duration and a 5-second delay, encouraging students to explore the dynamics of coast time, altitude maximization, and recovery system deployment. This engine supports lessons in Newton’s laws, forces and motion, and trajectory planning, while offering a hands-on platform for designing and testing heavier or larger rocket builds.

With a max lift weight of 5.0 oz (142 g), the C11-5 works well with a variety of Estes kits used in educational settings, especially those where students are customizing payloads or extending rocket dimensions. Its powerful 22.10 N peak thrust provides enough lift for heavier rockets while maintaining reliable and consistent results for instructional settings.

Each pack includes two engines, two starters, and four starter plugs—ready for student use in structured curriculum or enrichment activities. Add the C11-5 to your program to give learners the tools to go higher, test further, and think deeper about real-world physics and engineering.

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.