Originally Posted by dougmontgomery
Without looking through all the Polars what is the difference between your 100 and 300 series of airfoils.
AB100 series for symmetrical airfoil tipical usage elevator, rudder and motor aerobatics model (alternative classic NACA 4 digit)
AB230 is the first public series for gliders or fast model
AB330 is last series for gliders and fast model, but often more laminar airfoil
which is better for maximum speed.