The Estes F15-4 engine is a single stage engine designed for model rocket flight. This engine is a 29mm diameter engine designed for rockets with a maximum lift weight of less than 21 ounces. This engine is powerful enough for a wide range of launches, providing up to 49.61 Newton-seconds of total impulse. All components are designed for reliability and to ensure maximum safety during flight.

Engine bulk packs come with rocket engine supplies you need to launch 8 rockets. Included are 8 rocket engines, 10 model rocket starters, and 8 starter plugs. Please note that recovery wadding is not included. Use the F15-4 engine to launch some of the largest rockets of the Estes model rocket family!

ATTENTION: These engines cannot be sent to post office boxes. Please be sure to provide a PHYSICAL ADDRESS when purchasing E and F sized engines.

ATTENTION: Estes Industries, LLC requires all purchasers and users of Estes® Model Rocket Engines to adhere strictly to all applicable local, state, and federal laws, regulations, and safety standards. The user assumes all responsibility for the safe and lawful use of Estes® products. Estes Industries, LLC expressly disclaims any and all liability for personal injury, property damage, or other loss resulting from the misuse, improper handling, or unauthorized application of its model rocket engines.