As much as I wanted Jr. Driver's pinewood derby car to be a four-ringer...
#16
Here's the last pine car I made (for 8th grade Tech class.) C02 powered dragster >
Teacher gave us a block of pine with a hole in it, and we had about a week to make it into a functional dragster. There are two small eyelets on the bottom, through which a guide wire was run. These things were FAST
<img src="http://pictureposter.audiworld.com/121340/dsc00039.jpg">
<img src="http://pictureposter.audiworld.com/121340/dsc00039.jpg">