Photograph by Tina Williams
MODEL WIND TUNNEL
Getting (or going over) the edge on Pinewood Derby day.
Last year, at the annual Pinewood Derby race for our local Cub Scout pack, we used a Matchbox radar gun (see MAKE, Volume 10, page 148) to measure the top speeds of several cars. We learned that they reached 10mph–11mph at the bottom of the slope. Armed with this knowledge, along with some Lexan plastic, a fan, and a precise digital scale, it was time to build a wind tunnel for this year’s event.
I wanted to keep all the elements ...
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