D6516-S - Don Ayers
Max thickness: 6.5% at x = 26.46% chord
Max camber: 1.6% at x = 39.72% chord
Available data sources:
JavaFoil+Calcfoil stall+Eppler ext transition
The first two digits represent the airfoil thickness in tenths of a percent.
The second two digits represent the camber in tenths of a percent.
Coordinates from https://www.rcgroups.com/forums/showthread.php?1016239-Download-airfoils-here