Derby Monkey and BoysDad.com have free Pinewood Derby car designs available for viewing and printing. Site visitors can select from several car types, which all adhere to the regulation of the car not exceeding 7 inches in length.
On Derby Monkey's site users can select from 21 different Pinewood Derby car designs, ranging from arrow to vortex patterns. Each pattern comes as a PDF document that outlines the length and width of each part of the car. This site also provides tips on how to effectively use each pattern. BoysDad.com provides several aerodynamic design types to ensure top speed on the track; the PDF files show length, width and tire placement.