We built and launched the Estes classic Big Bertha - I had this rocket when I was 10 years old but it did not last long :( We used the B6-4 Motor for the first launch and the C6-5 for the second launch. The build took about one day but was worth the wait. We hope to strap a camera on to Big Bertha to get a cool launch video in the future. You can find Big Bertha on Amazon.com selling for $19.99 and at 24" tall she is a beauty and super fun rocket to launch with the family!! Please subscribe to our channel if you want to see more videos.