I saw your very nice pine wood derby cars. If your cub scout pack also do raingutter regatta, here is a winning design. My son built one, and it is faster than anybody else's. http://images.google.com/imgres?imgurl=http://webpages.charter.net/cschott/boat/boat_rear.jpg&imgrefurl=http://webpages.charter.net/cschott/boat/supercat.html&usg=__fz2ay8HBFFj4IHSixxL_7vM9-R8=&h=368&w=491 ...