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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 cons
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C11-5
Overall a good performing engine in rockets that use D or even E engines especially as an initial use. Had an engine failure in one, which is rare and could occur with any engine, not just the C11-5, so I couldn’t give it 5 stars in this rating. Customer service gets 5 stars for promptly answering and addressing the problem and immediately giving me a store credit equal to the damaged rocket and a pack of engines. I just had to provide pictures of the damaged rocket and lot number of the engine.
