One of my top goals was to have maximum participation. In order to do that we used a system called the perfect N which is sort of like a modified round robin tournament. Every racer raced four times, once in each lane. It was great. The only delays were the time it took to wind each rocket. There was also a few technical problems and kinks we worked out on the way but still everybody raced 4 times. Twenty heats is a lot of heats for a space derby.
I know it went well because after the official heats were over people wanted to race some more just for fun. And that is what Cub Scouting is supposed to be, fun with a purpose. Mostly, it was the joy of watching my own son getting a ribbon and a huge smile. Being a dad is very cool.