Fins work best when they’re tight against the hull throughout their rotation. Water escaping between the top of the fin and the hull adds drag, reduces efficiency. Here, a section of the round bottom has been flattened to accommodate the fin.
If you missed this one at the Ft. Lauderdale International Boat Show, you may need to hunt her up at the upcoming shows in Miami. Because she has to be seen in person to be believed. Check out the latest Magnum here. ▶