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.