Mercedes-AMG has its branded Cigarette boats, and Honda builds outboard engines, but no automaker has a watercraft quite like this Ferrari V-12 hydroplane, dubbed Arno XI. Built in the 1950s to chase a speed record, it’s now for sale through DuPont Registry.
First spotted by Road & Track, the Arno XI was developed in-house by Ferrari in partnership with speedboat racer Achille Castoldi, who pitched the idea directly to Enzo Ferrari. The goal was to sett a world speed record in the 800-kilogram class.
Castoldi bought a 4.5-liter V-12 for the project, but Enzo had it replaced with a racing engine from the Scuderia Ferrari stable. It produced 550 to 600 horsepower in race tune, according to the listing. The engine was installed in a hardwood hydroplane hull, designed to skim over the top of the water at speed.
The Arno XI went on to set the