Re: Pinewood Derby Anyone?
All in the axles and weight.
Polish the cr*p out of the axles, and then polish them again. Graphite the axles well and then run them in so that the graphite is on both the axle surface and the plastic wheel hub surface, make sure the alignment of the axles is correct (the wheel can turn freely, not too tight), sand the casting flash off the wheels, put the weight in the rear of the car, (if you don't have one get a digital mail scale so that you can make adjustments as you build the car and get right on the 5.0 ounce limit).
The fastest cars I have seen are the simplest designs (flat or wedge shapes).
Oh yeah - don't forget to have fun with your son.
Jake
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