When a keel this deep, with this small a bearing surface, is mated to a high-tech cored hull and the boat then hits something hard, the results are not pretty. You can see the scope of the repair by the discoloured area in the top photo. A repair that cost over a hundred thousand dollars because the entire structural grid was separated from the hull and much of the interior cabinetry had to be removed to reattach it.
In Part 1 we looked at the impact resistance of several common boat building materials. Now, in this post, we will examine what happens in a grounding or collision and what proper design can do to ameliorate the damage.