010019 Estes B4-4 Engines - 18mm Custom Rockets Consider using this for multiple

Consider using this for multiple rockets by not using or finishing the switch band

5" Rockets keeping the overall weight to a minimum

Estimated Assembly Time 1 Hour (painting and glue drying time not included)  Download Instructions

2cm) Diameter 1

010019 Estes B4-4 Engines - 18mm Custom Rockets Consider using this for multiple010019 Estes B4 4 Engines 18mm 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 plugseverything you need for several successful launches. Ideal for hobbyists and STEM projects alike, the B4 4 delivers steady