This Naiad fin is pressed onto its splined shaft, and stays put without fastenings. Removing it requires special equipment, though. Note the narrow winglet at the tip of the fin to make it more efficient.
When Capt. Bill Pike stepped aboard the Back Cove 41 he was expecting a traditional Down East vessel. But in terms of technology and advanced construction techniques, he found out there’s a whole lot more going on here than meets the eye. See what we mean, here. ▶