The Estes B4-4 Engine offers a dependable solution for retailers and distributors serving hobby shops, STEM programs, and youth organizations. This 18 mm single-stage engine delivers reliable mid-power performance for rockets under 3.5 ounces, making it a versatile addition to your engine inventory. Its consistent thrust and 4-second delay provide stable altitude gain and timely recovery system deployment—key factors for first-time users and experienced flyers alike.

Ideal for use with a wide range of Estes kits, the B4-4 fills a crucial gap between lower-powered A-class engines and more aggressive C-class options. The 4-second delay ensures recovery systems activate at peak altitude, offering a great balance of altitude and recovery reliability. This makes the B4-4 a popular choice among hobbyists who value smooth, predictable flights and safe recoveries.

Each retail-ready pack includes three B4-4 engines, four starters, and four starter plugs—enough to support multiple launches with added convenience. The inclusion of an extra starter per pack provides a built-in backup, helping reduce friction at the point of sale and increasing customer satisfaction. Packaging is designed for shelf appeal and clarity, supporting fast turns and easy upsells alongside compatible kits and accessories.

Whether you're restocking for the season or expanding your range of best-selling 18 mm engines, the B4-4 is a smart investment. Its versatility, performance consistency, and broad compatibility with Estes rockets make it a top seller in both educational and recreational segments. Offer your customers a reliable, trusted engine that keeps them coming back for repeat launches.

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.