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Old 11-06-2020, 07:29 AM
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That is a really good question for a "Noob". Cl max does depend on Reynolds number for many airfoils. If it is not listed, you either need to find what Re it was measured at, or make an assumption based on the use of the airfoil. Like, on an airfoil that was designed for full scale use, the CL max should only be trusted for that use. It should net be trusted if you use that airfoil on a model.

There is a really good web site that shows CL and other parameters for airfoils based on Re. Take a look at airfoiltools.com. You can pick an airfoil, and it automatically plots the CL, Cd anc Cm at different Re or Re you pick. . Plus you can pick 2 or more different airfoils and compare them.