How to Design a Fast Pine Car

Don't paint the car, since this may affect its speed. Instead, use low-weight decals to add personality.

Use pre-cut pine for the cars body unless you're handy with a saw.

Reduce the friction by lubricating the axles and the inner sides of the rims.

Sand and polish the small area directly under the nail heads. This is the point where the axles and wheels come together. Use a magnifying glass to check for any excess metal on the nails.

Add strategically placed weights to the car to maximize the effects of gravity. Remember that the weight limit is 5 ounces, so don't go over. You should be right at the correct weight. You can glue dimes to the car's chassis or drill small holes in the car to insert the appropriate extra weigh, such as small fishing weights. Use an accurate scale to weigh the car when done.

Test your car for balance by rolling it across a hardwood floor. Readjust the wheels and axles if it deviates from a straight line. Avoid adding moving parts or ornaments, as they can slow down the car.