Custom airfoil files may be used to define the shape of your cross-section. Apply these section types by choosing “AF_File” from the type dropdown menu and clicking the “Read File” button. This will allow you to browse for the AF or DAT file of your choice. OpenVSP will spline the points to generate the airfoil shape. By default, the baseline thickness to chord ratio will be calculated and set for the chosen section. However, you may also alter the thickness to chord if you wish, creating a new airfoil based on the original profile. Note that the camber line is conserved in this case. Detailed information about the AF file format can be found on the OpenVSP Wiki File Formats page. Many airfoil files and coordinates can be found on the UIUC Airfoil Database.