Julian Bill

André, thank you, this has fixed the problem.

Hi Jochen, thanks for your help. My issue is that I'm unable to recreate results seen in the sample project provided in the files section of xflr5 sourceforge. What I have described in my original post is symptoms of what happens when I try to recreate those results. I will attach an example. The first image is the oppoint for alpha=3 when you first open the sampleproject. The second image is the exact same oppoint, just that my computer did the calculation. They look very different. For the glider...

Hello, please see attached. Thanks

Hello, when trying to replicate the results in the sample project provided in sourceforge, I am encountering some strange errors, when alpha=3, the result is as shown in the attached image, the pressure coefficient on the wing is clearly wrong and is "stripey". It also appears something strange is happening at the wingtips; the centre of pressure is far forward of the wing. When a higher a.o.a is input, eg. alpha=5, the result is not converged due to, for example: "Cl = 1.40 could not be interpolated"....