Spencer Lincoln designed all of our boats, Duffy's and BHM's alike. With the exception of the 30', they are all built-down, semi-displacement boats. The BHM models have more flair in the bow and have a deeper draft for their length compared to Duffy models. The BHM's also carry their beam well aft, where the Duffy's have more tumblehome and a smaller beam at the transom. The sheer and tumblehome of the Duffy's uphold the graceful, traditional lobster boat style that many people are looking for.