Exporting Airfoil from DesignFOIL to AirfoilTools for Impeller Design

 DesignFOIL allows exporting airfoil coordinates in various formats, including DAT files. However, AirfoilTools specifically requires a DAT file format with a header containing specific information about the airfoil.

Here's how you can address this:

 * Check DesignFOIL's Export Options: Explore DesignFOIL's export options for DAT files. Look for settings that allow including a header with data like airfoil name, coordinates, and delimiters.

 * Match AirfoilTools' Requirements: If DesignFOIL doesn't provide the specific DAT format with a header, search online for tools or scripts that can convert a basic DAT file into the format required by AirfoilTools.

 * Alternative Export Methods: If exporting a compatible DAT file proves difficult, consider exporting the airfoil coordinates from DesignFOIL in a different format supported by AirfoilTools, such as CSV or TXT. You might need to manually edit the exported file to match AirfoilTools' requirements.