NACA 0018 - compressibility effects
 

I'm looking for information on a NACA 0018 airfoil. I have results (Pressure coefficient distribution is what I'm concerned with) for the airfoil in the incompressible flow regime which match well with my model, but when I run the model at Mach 0.6, I'm getting a slightly different profile of the Pcoef along the airfoil which seems to be a compressibility effect. I was wondering if anyone has any references with Pressure distributions for a NACA 0018 above Mach 0.3 (or any other NACA symmetric airfoil would be helpful to look at trends).

Thank you in advance! Jason

Re: NACA 0018 - compressibility effects
 

Googling

0012 mach

got some hits that may be useful.