Estes B4-4 Standard Engine(3) 010027 98" (25mm)

98" (25mm)

Universal Mounting kit to Fit Any Application

over-discharge and over-charge incidents which can be helpful data in assuring that the battery you’ve chosen is right for the application

Aluminum servo horn is Hot Racing HRAXMX4906

Estes B4-4 Standard Engine(3) 010027 98" (25mm)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 performance with every flight.