Choosing the proper stitch length is very important. If the stitches are too far apart, there will be to much stress on each individual thread. On the contrary if the stitches are too close together you are creating a perforation in the fabric and it is much more likely to rip. To find the middle ground I made a series of stitches in scrap pieces of fabric and tried to tear them.
The next step was to sew the panels and ribs together. The stitches in a straight line on the right side of the drawing are the outer layer of stitches, meaning the wing would take the shape of this line. The zig-zag stitches are a safety measure. If the first line of stitches was to tear, the panels would be held together by these stitches.