I could not find info on a plain old Y-15. Did find some references to
the Clark Y, Clark YH, Clark YM15, etc. They all apear to have a
slightly curved bottom plot all the way back to the trailing edge,
whereas the Y-15 in the Georgias plans is flat from about 15% back from
the leading edge all the way to the trailing edge.

Scott wrote:

Ok, I ran into a little problem...

I'm laying out the rib design for a 1931 Georgias Special and it uses a
Clark Y-15 airfoil. The coordinates (stations if you will) for upper
and lower surfaces start at the leading edge and go back to the rear
edge. Chord is supposed to be 48". Adding up the distances in the
drawings (the 1931 Flying and Glider Manual, reprinted by EAA) add up to
54 inches. So...does anyone have the airfoil coordinates for this
airfoil (and I assume they would be expressed as something like 2% (aft
of leading edge), bottom =0.75" lower surface and 1.5" upper surface, 5%
(aft of leading edge), bottom surface = 0.25", upper surface = 2.25",
etc.)? It would be even easier if someone had the coordinates for one
with a 48" chord

Thanks for any help!

Scott