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.
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?
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