Thomas Dalmas

Thank you for your reply. I am referring to the foil analysis module.

If I am not mistaken, on xflr5, Cm is defined relative to the point Xref = 0.25 (that cannot be changed). The approach of determining XCp by XCp = 0.25 - Cm/Cl can give results that are quite different from the XCp given directly by XFLR5. I imagine it is therefore better to use the XCp directly. What I don't necessarily understand is why, in the case of a symmetrical section, when AoA tends towards 0 (and therefore Cm and Cl tend towards 0), I get an XCp that tends towards 0.26 and not 0.25. (Except...

If I am not mistaken, on xflr5, Cm is defined relative to the point Xref = 0.25 (that cannot be changed). The approach of determining XCp by XCp = 0.25 - Cm/Cl can give results that are quite different from the XCp given directly by XFLR5. I imagine it is therefore better to use the XCp directly. What I don't necessarily understand is why, in the case of a symmetrical section, when AoA tends towards 0 (and therefore Cm and Cl tend towards 0), I get an XCp that tends towards 0.26 and not 0.25. (Except...