Correct me if I am wrong. This , I would think, would get you very close.

The airfoil isfully symetrical. Measure the chord at the root, measure the thickest point at the root. Figure the percentage of thickness to chord. Do the same thing at the tip chord. Most likely it is a NACA airfoil.

Example: 10" chord, 1" inch thick that is 10% so most likely a NACA0010 airfoil.