The Estes 1/2A3-4T engine is an upper stage engine (purple label) designed for model rocket flight. This engine can also be used as a single stage engine in lightweight rockets.
Safe, intelligent design, precise manufacture and strict engineering tolerances have made Estes model rocket engines the standard in the industry.
Estes model rocket engines have been proven consistent and reliable in more than 300,000,000 launches.
All Estes engines comply with the codes of the National Fire Protection Association and are certified by the National Association of Rocketry.
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