The 39 comes in two models: Hybrid and Solar. Both are impressive for their unorthodox design attributes. Greenline, if you couldn’t tell from the name, builds powerboats with small ecological footprints. As such, each boat has four solar panels atop the salon that can power all systems on board for three hours in the case of the Solar, or power the Hybrid’s 220 hp Volvo Penta D3 with a Mahle electric drive system. My 39 Solar test boat had the all-diesel 370 hp Yanmar V-8 diesel option, which is de rigueur for boaters with more traditional outlooks on power. Regardless of the engines, Greenline’s vessels have become popular among former sailors. That’s in large part owed to the boat’s ecologically conscious focus, but I would wager the elegant simplicity of the 39’s layout plays a role as well.