I was looking for a quick, easy way to add weight to a Pinewood Derby car. You can use lead or tungsten, but they are relatively expensive ($1 - 2 per ounce), come in odd shapes, and you have to figure out a way to attach them to the car. Pennies, which are 97% zinc cost about $0.10 per ounce (or free if you find them under the sofa). An ounce of penny is the same weight as an ounce of lead, so why not go cheap. What you loose in increased volume needed for the same mass, you make up for with the utility of a uniform size and weight object.
Disclaimer: This is my daughter's car, so no comments about pink or the hearts, please!
Also, no pennies were harmed in the process of this Instructable!
Step 1: Supplies
Things you need:
- accurate scale.
- 3/4" drill bit and drill.
- some loose pennies.
- masking tape (optional).
- hot glue or epoxy (optional).