You are given four statements about the NACA airfoil with code “XYZZ”:
The X stands for the camber as percentage of the wing chord length. The Y indicates the thickness of the airfoil. When ZZ is 00, then the NACA-code is non-realistic., When XY is 00, then the airfoil is a symmetric airfoil. Which statement is wrong?
The statement "When ZZ is 00, then the NACA-code is non-realistic" is wrong.
In actual NACA airfoil codes, ZZ being 00 does not make the NACA-code non-realistic. The ZZ digits usually represent the maximum thickness of the airfoil, typically ranging from 01 to 99 (in percentage of chord length). A value of 00 for ZZ is unrealistic as it indicates no thickness for the airfoil, which is not physically possible.