Estes B4-4 Model Rocket Engines - 3 Pack

The Estes B4-4 is a standard 18mm single-stage engine with a 4-second ejection delay, a step up in power from A-class motors for slightly heavier rockets. Total impulse 5.00 N-s.

Each pack includes 3 B4-4 engines, 4 starters, and 4 starter plugs.

Ships via USPS Ground Advantage under our USPS hazmat authorization. A physical street address is required for delivery - rocket engines cannot be shipped to a PO Box. Follow the Estes safety code and all local rules, and supervise young rocketeers.