The wingSkinType describes the material properties of the wing.

For composites materials: the positive z-direction is from the outer side to the inner side.

For composites materials: the reference axis for the orthotropyDirection is defined by the two leading edge points of the 'from'- and the 'to'-element of the componentSegment definition. The angle between the reference axis and the orthotropyDirection equals the rotation around the z-reference axis. For details, please refer to the picture below:

Reference