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