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9.13: Select Segment Airfoil

The standard airfoil with a newly created segment is Naca0010. Click the folder button 'Airfoil / Chord'. Click the button 'Airfoil' to select a different airfoil.



After clicking the button 'Airfoil' the airfoil selection window will open. Bottom left you can see the directory tree which was created with the function 'Preferences / Directories'. You can use the tree-view to change the directory.
Bottom centre is the list with the available airfoils displayed. Click the desired airfoil and afterwards the button 'Apply Airfoil'. The selection window will be closed and the airfoil will be implemented into the wing.



The button 'Interpol. Airfoil' is deactivated when one of the both tip segments is selected. If a segment is selected, which lies between two segments with different airfoils, the button 'Interpol. Airfoil' can be used to change the airfoil of this middle segment to an interpolated airfoil.

Near button 'Airfoil' you find a button 'inv.'. It is used to invert the airfoil. The coordinates of upper surface are swapped with those of the lower surface.

The following pictures show three wings. The left wing has a root airfoil Naca0010, the middle wing has an E377M and the right wing has an inverted E377M airfoil.
With a symmetric airfoil inverting makes no sense, because upper and lower surface have equal shape.



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