The stiffener, the square-sectioned part on the left in the image, should have been laminated to the plywood frame it intersects but was not. Instead, the two were simply butted together. This caused more movement than should have existed had proper lamination techniques been used. In addition, some laminate was missing from the original design, making the shell even more flexible in this location. Whether this was due to cost-cutting or the lamination crew’s failure to do the job as specified cannot be determined. Finally, the quality of the laminate was poor, with both dry fiber and trapped air present, as seen through the core sample taken through the crack. Be sure to look for wide tabbing or fabric overlapping mating surfaces when inspecting a boat. Also, you can’t be expected to take core samples like I do, but do look for dry spots by keeping an eye out for white areas, indicating cloth not wet with enough resin.