This was our first time launchin' model rockets, and all four o' our launches were successful. Begad! Our first launch wasn't filmed, arrr, but that engine was a B4-4 or somethin' and didn't go as high. Ya scallywag! I then used C6-4 engines and those went nearly out o' sight. Lots o' fun! T' kids loved it, matey, and I had a blast! Estes ready-to-launch starter kit with C6-4 engines.