Hi,
I need to known what is the best wing airfoil for 3d plane in '88 class
For example what kind of airfoil use ExtremeFlight or 3DHS in their model?
And for tail it is better to use the same airfoil?
Thanks

About any NACA airfoil with the thickest part near the spar will work fine. Those spars will tend to be near the 30% area in terms of placement. I don't believe there is a magic airfoil. I have seen thick and thin airfoils fly equally well. Good luck.
Jeff

NACA 00xx. You would want a symmetric airfoil. This will produce equal lift whether right-side-up or upside-down flight. If you have an airfoil that is not symmetric (has camber), it will favor lifting when the aircraft is flying normal, but will not want to perform when upside-down.

Take a look at J-Tech Radio Wave. They used an airfoil that had a sharp leading edge. At least they did on the old Radio Craft ARF's. I had one, and that airplane would squat down like none other. Virtually no wing rock, anyway, I think there is some video floating around of Tavis Newman flying one.