What is there about this airfoil which provides an improvement for models of this size?
I ask, because I find that if models of this size - have a structurally good wing-- the really relevant factor is simply wing loading .
a simple shape such as the old 2412 -or even a sym foil of 12 %-- are effectively the same .
The flying speed of these model aircraft is so varied - that I simply can't see how one can develop a superior foil for such broad parameters of use.
That this airfoil will be better at a specific point (aoa and speed )-I can understand
If someone really can explain this - please steop up .
On gliders - where parameters ar much tighter - i understand how shape can be more critical -but not on models such as described here.

Dick the increase in goodness might just be a little but in a field such as aerodynamics where we have developed pretty good airfoils as of this date and where any performance increase, even a percent or two, is good, then someone with the proper tools can design an airfoil that is better. I don't know if we could say they are superior like it was twice as good or something but it can be just a little better and might make the difference in winning and coming in second.

Yes most airfoils are optimized for a single point but they don't rapidly fall apart at speeds around that point either. The difference between using an airfoil that is optimized for high lift gliders and a nice symmetrical airfoil when used on a pattern ship is pretty obvious, it would be hard to fly a pattern with the high lift glider airfoil. We could then say the symmetrical airfoil is superior. If we are trying to wring the last bit of goodness out of an airfoil then the differences between two symmetrical airfoils might be difficult to determine by just test flying but might be evident in a wind tunnel test. You could say one is slightly better but not superior in the sense of really better.

On a pattern ship we have moved from 15 -18 percent thick airfoils used in the 60s and 70s to the very thin sections used in today's airplanes. We could say the modern airfoils are superior for our present pattern use. But a slight iteration on the present thin section might produce at best a slightly better airfoil, but doubtful that it would be superior.