Description: Estes 010042 F15-8 Engines (29 mm) The F15-8 engine offers a robust thrust profile, enabling your rocket to achieve significant heights with a smooth and steady ascent. The 8-second delay before ejection is optimal for rockets that benefit from an extended coasting period, ensuring peak altitude is reached before deploying the recovery system. These engines are compatible with model rockets designed for 29 mm diameter engines and capable of handling F-class impulse. Always refer to your rocket's specifications to ensure suitability and safe operation. Each package includes 2 engines, 2 starters and 4 starter plugs. Elevate your rocketry adventures with the Estes F15-8 Model Rocket Engines, delivering the power and performance needed for thrilling high-altitude flights. Prepare for launch and experience the excitement of reaching new heights! Includes: ¢ 2 F15-8 Engines ¢ 2 Starters ¢ 4 Starter Plugs