C11-5 Engines

The Estes C11-5 engine delivers a powerful punch for mid-weight rockets ready to soar. This single-stage engine features a 24 mm diameter and 10.00 N-sec of total impulse, making it a reliable choice for modelers looking for extra lift without moving up to E-class engines. Whether you're launching for altitude or demonstrating flight consistency, the C11-5 offers performance you can count on.

With a 5-second delay, the C11-5 strikes a great balance between boost and recovery deployment—ideal for rockets that require more coast time to maximize altitude before ejection. It delivers up to 22.10 newtons of max thrust, giving your rocket the force it needs to get off the pad with authority. The C11-5’s power and profile make it a perfect fit for rockets that are too heavy for a B or C6 but not quite ready for an E engine.

The engine’s 0.80-second thrust duration ensures a quick and responsive launch phase, helping stabilize your rocket as it climbs. With a max lift weight of 5.0 oz (142 g), the C11-5 works well with a wide range of mid-sized rocket kits in the Estes lineup and beyond. It’s a versatile choice for flyers who want to push their altitudes while keeping control and reliability at the forefront.

Each pack includes two engines, two starters, and four starter plugs—everything you need to power two thrilling flights. Whether you're a seasoned modeler or taking your next step up in engine class, the Estes C11-5 brings confidence and performance to your next launch.

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.