Sounds like a blast! It would be a shame to restrict these to the students just because 'we' happen to be a little "mature" (ie. heavy.)

Looking at the examples you have shown and the fact that the dominant car has no aerodynamics, do you think that lower weight is more important than lower wind resistance? Or is it a better motor/driveline efficiency that contributes to it's success?

I think you are right about the "Sun Day Challenge"......and it may well have been grade eight rather than high school. Memory is a bit hazy at times.