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1/2A6-2 Engines for Flying Model Rockets

1/2A6-2 Model Rocket Engines with Ignitors and Plugs

001593 - 1/2A6 Rocket Engine Thrust Curve Chart

Estes 18mm Rocket Engine Assembly How-To

Estes Rockets

1/2A6-2 Engines

$12.99

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.

Includes:: 3 × 1/2A6-2 Engines; 4 × Starters; 4 × Starter Plugs

PLEASE NOTE: You must have a physical address for delivery.

SKU 010016

Flight Performance

Understand how the 1/2A6-2 Engines deliver lift, acceleration, and a smooth flight profile from launch to recovery.

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: 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.

Technical Specifications

Review the full specifications for the 1/2A6-2 Engines, including impulse, thrust duration, delay, and physical dimensions.

Total Impulse

1.25 N-sec

Time Delay

2 Seconds

Max Lift Weight

2.0 oz. (57 g)

Max Thrust

8.90 Newtons (2.0 lbs)

Thrust Duration

0.30 Seconds

Length

2.75 in. (7 cm)

Diameter

18 mm

Weight

0.48 oz. (13.6 g)

Propellant Weight

0.10 oz. (2.7 g)

Choose the Right Rocket

These rockets are designed to fly with the 1/2A6-2 Engines for optimal performance and consistent flight results.

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