SAMPLE DAT FILE

Download:
CLARK-Y airfoil
DAT.xls file to visualize and modify your shape.

CLARK-Y.DAT

First line of the file is ignored by the software and can contain design notes. Following lines contain X and Y coordinates of the shape (normalized).
Contour of the shape starts at right-most point (TE) continues towards left through left-most point (LE) and finishes where it started.

DAT.xls

You can use DAT.xls file to help you visualize desired shape, there are several tabs in that file, showing different shapes as well as CLARK Y airfoil.
Feel free to modify coordinates and see how the shape changes. You can use it to develop coordinate file for your desired shape.