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Estes B4-4 Model Rocket Engines with Plugs and Ignitors

B4 Model Rocket Engine Thrust Curve Chart

Estes 18mm Rocket Engine Assembly How-To

Estes Rockets

B4-4 Engines

$12.99

The Estes B4-4 is a reliable, single-stage 18 mm engine designed for model rockets weighing under 3.5 ounces. With a balanced 4-second delay, it's a perfect fit for smooth, stable flights and consistent recovery deployment.

Each 3-pack includes three engines, four starters, and four starter plugs; everything you need for several successful launches. Ideal for hobbyists and STEM projects alike, the B4-4 delivers steady performance with every flight.

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

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

SKU 010019

Flight Performance

Understand how the B4-4 Engines deliver lift, acceleration, and a smooth flight profile from launch to recovery.

The Estes B4-4 Rocket Engines are ideal for mid-powered model rockets that demand a steady climb and reliable deployment. These single-stage, 18 mm engines offer a balanced performance with moderate thrust, making them a great choice for both new hobbyists and seasoned flyers looking for consistent flight results. The B4-4 is specifically designed for rockets weighing less than 3.5 ounces, including the engine, and provides dependable altitude and ejection timing for small to mid-size models.

These engines feature a thrust duration that supports a smooth boost phase, followed by a 4-second delay that allows rockets to reach peak altitude before recovery system deployment. This delay makes the B4-4 especially suitable for rockets with moderate drag and stable flight characteristics. Whether you're launching in a park, field, or on a certified range, you can count on a satisfying launch profile with every flight.

Each package includes three B4-4 engines along with four starters and four plugs, giving you everything needed for multiple launches. The extra starter adds an extra level of convenience and value—ideal for those who like to be prepared on launch day. Estes' attention to safety and performance ensures that each engine delivers the reliability that model rocket enthusiasts have trusted for decades.

Whether you're conducting a classroom demo, building your personal fleet, or hosting a weekend launch session, the B4-4 engine is a proven performer. Its moderate power and predictable deployment make it a smart option for a wide range of Estes kits and compatible low- to mid-weight rockets. Get ready for consistent results and fun flights with this time-tested engine.

Estes B4-4 Model Rocket Engines are compatible with a large number of Estes rocket kits, including but not limited to:

1225 Alpha
1292 Wizard
1261 Baby Bertha
1946 Boosted Bertha
1948 Big Bertha
1949 Viking
2008 Generic 2X
2021 Cadet
2056 US Army Patriot
2092 Mongoose
2169 Dragonite
2178 Hi-Flier
2452 Athena
2483 Phantom Blue
7000 Bull Pup 12D
7220 Crossfire ISX
7245 Comanche-3
7259 Nike-X
7281 Corvetter
7284 Starship
7291 Space Corps Centurion

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 B4-4 Engines, including impulse, thrust duration, delay, and physical dimensions.

Total Impulse

5.00 N-sec

Time Delay

4 Seconds

Max Lift Weight

3.5 oz. (99 g)

Thrust Duration

1.10 Seconds

Length

2.8 in. (7 cm)

Diameter

18 mm

Weight

0.68 oz. (19.3 g)

Propellant Weight

0.27 oz. (7.6 g)

Choose the Right Rocket

These rockets are designed to fly with the B4-4 Engines for optimal performance and consistent flight results.

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