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$150 MINIMUM ORDER, FREE SHIPPING OVER $750
The Estes 1/2A6‑2 is a single-stage 18 mm engine ideal for model rockets under 2 oz. With 1.25 N‑s impulse, 8.9 N thrust, and a 2‑second delay, it provides smooth, controlled launches. Includes three engines, four starters, and four plugs.
Designed for educational use, backyard flights, and beginner kits, the 1/2A6‑2 delivers safe, consistent performance across smaller flying fields.
PLEASE NOTE: You must have a physical address for delivery.
The Estes 1/2A6‑2 engine is a single-stage, standard 18 mm engine tailored for rockets weighing under 2 oz (57 g) including engine—perfect for lightweight beginner models and small-field flights. Each package includes three engines, four igniters, and four starter plugs, so you’re ready to launch multiple rockets straight out of the box.
With a total impulse of 1.25 N‑s, a peak thrust of 8.90 N (2.0 lb), and a brief thrust duration of just 0.30 s, the 1/2A6‑2 delivers smooth yet dependable lift-off for small-scale rockets. After engine burn-out, the 2-second delay allows the rocket to coast to apogee before ejection, producing a controlled and safe recovery without overstressing your model.
Measuring 2.75″ in length and sized at 18 mm diameter, this engine complements a wide range of Estes beginner kits like Alpha III®, Hi‑Flier®, Wizard™, and Astron Constellation™, providing ideal performance for short to moderate altitude launches. At only 0.48 oz (13.6 g) with 0.10 oz (2.7 g) of propellant, it offers a well-balanced thrust-to-weight ratio for stable flight dynamics.
Perfect for educational use, backyard launches, and STEM programming, the 1/2A6‑2 is a trusted engine that consistently delivers repeatable results. Its combination of modest power, simplicity, and high reliability continues the Estes legacy of making model rocketry accessible and fun for all levels of rocketeers.
ATTENTION: Residents of California, New Jersey, Rhode Island and North Dakota please review the Terms of Sale for state specific restrictions or Click Here for State Specific Restrictions.
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My science classes built Viking rockets and launched thee ed m with 1/2A6-2 Engines. Theyre perfect for being able to launch on breezy days because they dont go too high, so recovery is easier. What a blast!
Good
Used them for a Lunar Launch Spot contest. Performed as expected, as we were able to predict arc and duration. We came within 5.5 meters of the target.