Consistent 5.00 N·s total impulse ensures reliable altitude and recovery timing
2-second delay provides controlled burn and smooth recovery
Clean, steady thrust reduces variability between flights
Compatible with a wide range of lightweight model rockets
Simple prep and use for hassle-free launches
Summarized by Shop
**For local delivery only - we cannot currently ship rocket engines.**
The Estes B4-2 engine is single stage engine designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 4 ounces, including the engine. Each package includes 3 engines, 4 starters and 4 plugs.