So you say you need to know the drag coefficient (CD) of your vehicle in order to
perform acceleration, top speed, and other calculations, but you don't have your own wind
tunnel or time for building scale models? Speed-Wiz can help! By performing
coast-down time tests, you can get a very close estimate of your vehicle's CD. As an extra
bonus you also get the rolling resistance coefficient.

By performing simple coast down tests and calculating your car's frontal area,
you can get a very good idea of your car's coefficient of drag and coefficient of rolling resistance.