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Looking to build a RC plane. Because the span is going to be small and the speed relatively low, I estimate the R-number to be around 100,000. Is there an airfoil optimized for that range of Reynold's Number?

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Try the HQ series from the UIUC Airfoil Data Site. That is HQ as in Helmut Quabeck (model airfoils), not Horstmann-Quast (those would be glider airfoils).

Another possible source is the website of Martin Hepperle.

Unfortunately, there is not one, but hundreds of airfoils optimized for the model aircraft range of Reynolds numbers. To be any more specific, I would need to know more about how you plan to use that model:

  • Will it be a glider with a low wing loading, trying to stay aloft as long as possible?
  • Will it be a fast glider for ridge racing?
  • Will it be a powered model for aerobatics?

Each case will need different airfoils.

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  • $\begingroup$ Right... I am thinking of a medium-slow speed (10-15m/s) powered plane mainly geared for endurance. I suppose it will be closer in design to a glider. Thanks! $\endgroup$
    – Mord42
    Commented Aug 27, 2018 at 22:20

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