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.
