This resource from Boxford describes the manufacture of a small wind tunnel suitable for use in conjunction with the Scalextric 4 Schools competition. It includes CAD files and pictures of the assembled wind tunnel. The design features of the wind tunnel are outlines and consideration is given to how it is used, such as the method of generating the smoke. Supporting photographs show the assembly of several features of the tunnel. Curriculum links include testing and modifying designs and using mathematical modelling to assess the quality of a design solution.