B4-2 Engines

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.