2) BSA® Style Axle Modifications: bsa_axle1.pdf
3) BSA® Style Standard Block Dimensions and Mass Properties: bsa_block.pdf
5) Tungsten Car Weight drawing (tungsten.pdf)
6) Pinewood Derby Physics (Where to put the weight)
- Density of Lead (Pb) = .4097 lbs/in3 (lead is toxic – limit your exposure). Click here for more about lead and where to get it.
- Density of Tungsten (W) = .697 lbs/in3 Notice that for a given volume, tungsten is much heavier than lead. This allows you to concentrate the weight exactly where you want it (Note: tungsten welding electrodes marked “thoriated” contain slightly radioactive thorium, don’t grind them) Click here for more about Tungsten and where to get it.
- Density of Pine = 0.01381 lbs/in3 Note: This number should be taken only as a guide. The density can vary widely depending on factors including growing season conditions, relative humidity, and other conditions.
Note: Engineering data is believed to be accurate, but is not warranted in any way. Always use your best judgment, and verify weights.
Always check your build with a good quality kitchen scale to be sure you are close. A scale is probably the most important tool when building your car.