Just a quick addition to Mark Elias pinewood derby comments.
Our pack has also used this system VERY SUCCESSFULLY for more
years than I have been involved (ie 6+ years). We define
1) the boys have fun
2) the boys enjoy the WHOLE experience
3) we fairly and accurately determine the winners
I used the Alta Vista search for the Stearns Method:
Here are the URLs:
The first page has links to the other pages. Check it out,
although the program has some quirks, I highly recommend
this racing method.