Powerful, reliable, and built for serious flights, the F15-2 Engines deliver the sustained thrust you need for larger model rockets, higher altitude launches, and dependable flight performance. Each engine produces 49.61 N-sec of total impulse, 25.26 N of max thrust, and a long 3.45 second burn that gives your rockets a bold, steady climb from ignition to recovery. With a 2 second delay and smooth, consistent performance, F15-2 Engines make every launch more predictable and exciting. You’ll enjoy the strong lift, clean transition to recovery, and dependable timing that make these engines a favorite among experienced rocketeers. Whether you’re flying a new build or a proven favorite, you can count on Estes reliability every time you hit the launch button. Includes: 2 × F15-2 Engines 2 × Starters 4 × Starter Plugs