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My kids had a lot of winners in their day, but
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Posted by Osvensk [Email] (#272) [Profile/Gallery] (more from Osvensk) on Tue, 25 Jan 2011 07:42:15 Share Post by Email
In Reply to: Re: Pinewood Derby Saab....anyone ever make one?, BTG88, Mon, 24 Jan 2011 18:13:49
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we prefered to build in Indycar or Formula car type shapes, tapering from a sharp wedge front end upward to the rear, because one of the boys built a miniature wind tunnel with an old computer cooling fan motor providing the wind for a science fair project in the 6th grade and he found that the wedges had far less drag. But we also found that the most important thing for winning was having the wheels perfectly align, with a tiny bit of negative camber at both ends, so that the cars didn't rattle back and forth against the center rail as they came down the ramp.

I also used lead 357 Mag. semi-wadcutters from my reloading molds pressed into holes in the bottom of the cars to bring the weight up to just below the absolute maximum. Some of the teachers were a bit offended by this source of weight, and they might be banned from schoolgrounds nowadays.

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