Mabelle, Hull No. 4 of Arcadia Yachts’ Sherpa 80 XL, shows how size, efficiency and personalization can coexist. The fourth Sherpa 80 XL from Arcadia Yachts, Mabelle, is an exercise in optimizing multifunctional space on a compact explorer footprint.  Launched in summer 2022 on Italy’s Sorrento coast, the 78-foot (24-meter) boat—which Arcadia likens to a “pocket…