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
Technical Specifications
Total Impulse 5.00 N-sec
Time Delay 4 Seconds
Max Lift Weight 3.5 oz (99 g)
Max Thrust 13.20 Newtons (3.0 lbs)
Thrust Duration 1.10 Seconds
Length 2.8 in. (7 cm)
Diameter 18 mm
Weight .68 oz. (19.3 g)
Propellant Weight 0.27 oz (7.6 g)
Please Note: Photos may not be of the same packaging, but nothing will be sold older than what is received from our distributor.
This item will ship by US Postal Service only from ModelRocketGuy.com at this time.
