Estes B4-2 Model Rocket Engines with Plugs and Ignitors

B4 Model Rocket Engine Thrust Curve Chart

Estes B4-2 Model Rocket Engines Assembly How-To

Estes 18mm Rocket Engine Assembly How-To Video

Estes Rockets

B4-2 Engines

$13.99

The Estes B4-2 is a dependable single stage model rocket engine built for consistent, enjoyable flights in lightweight rockets. Designed to deliver steady, usable thrust for rockets under 4 ounces, this engine gives hobbyists reliable lift and smooth flight profiles that make launching simple and satisfying.

Whether you are teaching a new rocketeer, flying at a club launch, or enjoying backyard hobby flights, the B4-2 balances performance and predictability. Its clean burn and dependable ignition help reduce launch day surprises so you can focus on building great flights and good memories.

Includes:: 3 × B4-2 Engines; 4 × Starters; 4 × Starter Plugs

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

SKU 010018

Flight Performance

Understand how the B4-2 Engines deliver lift, acceleration, and a smooth flight profile from launch to recovery.

Engineered for straightforward, repeatable performance, the Estes B4-2 provides the reliable thrust you want from a standard model rocket engine. Its balanced burn delivers predictable altitude and recovery timing, making it an ideal choice for beginners learning flight dynamics as well as experienced fliers who appreciate consistent results.

What makes the B4-2 stand out is its combination of ease of use and dependable manufacturing quality. The casing and propellant formulation produce clean, steady thrust with consistent delay timing, which reduces variability between flights. That consistent performance helps you tune recovery systems, estimate apogee, and teach flight concepts with confidence.

The B4-2 is versatile in application. Use it for small display flights, classroom demos, club launches, and friendly competitions where predictable, safe performance matters. Its size and impulse make it a great match for a wide range of lightweight rockets and kits without adding unnecessary complexity to your build.

Each pack is ready-to-launch friendly and ideal for stocking your launch box. Pick up a pack of B4-2 engines when you want dependable flights, simple prep, and more time enjoying launches. Add them to your next order and get back to what matters most, launching rockets and having fun.

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 B4-2 Engines, including impulse, thrust duration, delay, and physical dimensions.

Total Impulse

5.00 N-sec

Time Delay

2 Seconds

Max Lift Weight

4.0 oz. (113 g)

Max Thrust

13.20 Newtons (3.0 lbs)

Thrust Duration

1.10 Seconds

Length

2.8 in. (7 cm)

Diameter

18 mm

Weight

0.66 oz. (18.7 g)

Propellant Weight

0.27 oz. (7.6 g)

Choose the Right Rocket

These rockets are designed to fly with the B4-2 Engines for optimal performance and consistent flight results.

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B4-2 Engines