010019 Estes B4-4 Engines - 18mm

010019 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 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 Impulse5.00 N-sec Time Delay4 Seconds Max Lift Weight3.5 oz (99 g) Max Thrust13.20 Newtons (3.0 lbs) Thrust Duration1.10 Seconds Length2.8 in. (7 cm) Diameter18 mm Weight.68 oz. (19.3 g) Propellant Weight0.27 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 ModelRo