ORIGINAL: wellss
The optimum thickness for models is 12%. Thicker airfoils don't show improvement until high Reynolds number ( full size ). Looks like Mike Hurley knows what he's doing.
Wow, thats a pretty broad statement. Are you refering to all R/C? I fly a pattern plane with 18% and its one of the most popularwings ever designed for R/C. The same wing is found on the Kwik-Fly, Kaos, and UltraSport's.