shell layers start_nd_arc and end_nd_arc should be anchored at 0 and 1 (TE midpoint)
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The start_nd_arc and end_nd_arc definitions of shell layers at the trailing edge are defined to start and stop at the edge of the trailing edge, and do not start at 0.0 and end at 1.0.
This is due to the specific implementation in our design tool, where we define the arc length starting and ending at the edges of the open trailing edge, where the TE is then treated separately from the shell part. WindIO defines the start_nd_arc and end_nd_arc to start and stop at the midpoint of the trailing edge. I didn't convert the arc positions to [0:1] range when exporting from the tool and this needs to be fixed.
For the time being users can assume that gelcoat, TE reinforcement and shell skin start and stop at 0 and 1 in the chordwise direction.
@KIDEVLIN and I have been observing this issue while working on ptrbortolotti/SONATA#8
One part of the problem is the limited fidelity of https://github.com/IEAWindTask37/windIO, which is not very well equipped for a detailed modeling of the trailing edge construction. This said, we'd say that it would be reasonable to set paint and outer shell skin to start at 0 and end at 1. Would you agree @fzahle ?