F15-4 Engine Bulk Pack

The Estes F15-4 Engine Bulk Pack gives hobby rocketeers reliable, high-performance power at a great value. This bulk pack contains everything you need to fuel eight launches - 8 F15-4 engines, 10 starters, and 8 starter plugs - making it ideal for group launches, club events, or anyone who likes to keep spare engines on hand for fast turnaround. These full-size 29 mm engines bring mid-power performance for larger model rockets while keeping handling and storage simple. Built for rocketeers who want dependable altitude and clean, repeatable performance, the F15-4 balances strong thrust with a predictable burn profile. The engine delivers a robust 49.61 N-sec of total impulse and a 4 second delay for comfortable recovery timing, so it launches heavier hobby rockets cleanly without sacrificing control. Whether you fly for fun, display, or competition, the F15-4’s consistent ignition and stable thrust make it a favorite when you need confidence on the pad. Key flight specs you’ll want to k