Description

FERRARI HYDROPLANE 31"

FULLY BUILT AND READY TO DISPLAY, QUALITY SHIP MODEL

Dimension approx.: 31″ (long) x 12″ (wide) x 9″ (high)
The model is already built. THIS IS NOT A MODEL SHIP KIT

In the early 1950s, when speed records were national obsessions and engineering was a form of bravado, Italian racer Achille Castoldi set his sights on a new frontier: the 800‑kilogram hydroplane world speed record. Castoldi was already a veteran of the 400‑kg class, but he wanted something more — a machine so advanced, so powerful, that it would redefine what a racing boat could be. To build it, he approached the only man whose engines matched his ambition: Enzo Ferrari.

Ferrari was not easily persuaded, but Castoldi had allies. His friends Alberto Ascari and Luigi Villoresi, both Ferrari Formula 1 drivers, urged Enzo to support the project. The idea of a Ferrari engine screaming across the water — a new arena for the Prancing Horse — appealed to Ferrari’s competitive instincts. He agreed.

The hull was built at Cantieri Timossi on Lake Como, a sculptural wooden three‑pointer finished in Ferrari’s unmistakable Rosso Corsa. But the heart of the boat was pure Maranello: a 4.5‑liter Lampredi V12 from the Ferrari 375 F1, the same engine that had battled for Grand Prix victories. Initially tuned to around 385 horsepower, it was already formidable. But Castoldi wanted more.

He added twin superchargers, switched to methanol fuel, and pushed the V12 to over 600 horsepower — an astonishing figure for a hydroplane of its size. The propeller spun at 10,000 rpm, a metallic shriek that echoed across the lakes of northern Italy.

In January 1953, Castoldi began shakedown tests, pushing the Arno XI past 124 mph, then 140 mph. The boat danced across the water, balanced on its three points, the Ferrari V12 howling like nothing the hydroplane world had ever heard.

The decisive moment came on Lake Iseo in October 1953. Castoldi made two blistering passes, averaging 150.49 mph — a new world record in the 800‑kg class. As your source notes, that record still stands today. In a one‑way run, he hit 150.19 mph, confirming the boat’s dominance.

The Arno XI had done what it was built to do: it proved that Ferrari power could conquer not just racetracks, but water.

Castoldi retired from racing in 1954, but the Arno XI did not. It was purchased by engineer Nando dell’Orto, who modified the bodywork and campaigned the boat into the 1960s. In 1965, it finished second in the 900‑kg World Championship, a remarkable achievement for a machine already more than a decade old.

By the 1990s, the Arno XI had become a legend — a unicorn of motorsport history. It was restored to its original Ferrari‑backed configuration and displayed at events including the Museo Enzo Ferrari. Collectors began to circle. The boat appeared at auctions with estimates in the millions, and in 2021, it was offered at $12 million, reflecting its near‑mythic status.

Today, the Arno XI is undergoing a Ferrari Classiche restoration, complete with original engineering notes and U.I.M. record documentation. It is treated not as a boat, but as a priceless artifact — the only Ferrari‑powered hydroplane ever built, and one of the most extraordinary racing machines of the 20th century.

The Ferrari Arno XI remains a masterpiece of cross‑disciplinary engineering — a wooden hydroplane driven by a Formula 1 heart. It represents Ferrari’s brief but spectacular venture into water speed, Castoldi’s relentless pursuit of records, The artistry of Italian boatbuilding, and A world record that has endured for more than 70 years

More than a racing boat, it is a symbol of an era when innovation was fearless, boundaries were meant to be broken, and the roar of a Ferrari V12 could echo across a lake at 150 miles per hour.