“This run above 50 knots allowed us to finally observe the behavior of our foil in a speed range that remains largely unexplored in the world of sailing,” said Benoît Gaudiot, kite pilot aboard the SP80 experimental raceboat. “We deliberately slowed the boat down just before reaching 52 knots as a precaution, but our analysis of the data indicates that it did not encounter any major barriers.”

The slender, 33-foot foiling trimaran, with sponsons on both sides and a small, protected cockpit for the pilot and a co-pilot, performs more like a kiteboard than a traditional sailing yacht. The team hopes to not only break Vestas Sailrocket II’s record, but shatter it since its boat has a theoretical top speed of 80 knots, or 92 mph. Hence the SP80 name.

Despite its sponsorship by Swiss watchmaker Richard Mille, the SP80 initiative is a shoestring startup launched nine years ago by three friends—Mayeul van den Broek, Xavier Lepercq, and Benoit Gaudiot—who decided to create a boat that would cross the seemingly uncrossable 80-knot mark. The team is using a proprietary—and yet unproven—design that pairs the massive kitesurfing sails with a carbon-fiber hull weighing just 330 pounds. The trimaran initially took more than two years and 40,000 hours to design, and it has since gone through several iterations.

Under the rules, the SP80 is not allowed to use the same type of electronics or lithium batteries to help adjust the sails as, say, the America’s Cup or SailGP foilers, even though, proportionally speaking, the SP80 is facing a much higher load on its sails. It’s only allowed to use wind power. As a result, it is testing in one of the world’s windiest stretches outside Leucate, France.

“The boat is now close to its full technical potential,” says SP80 pilot Mayeul van den Broek. “The challenge for Benoît and I now is to sail as much as possible to master the boatʼs behavior from 0 to over 70 knots (130 km/h). We need to fine-tune our trajectories, improve our synchronization, and push the machine even further.”

“The weather has not always been favorable, with winds often too light to accumulate significant sailing hours,” added van den Broek. “But with each outing, we can feel it—the logistics are running smoothly, the boat wants to go faster. All we need now is more time on the water to unleash its full potential.”

It hopes to reach that potential in the next few weeks.

Meanwhile, the Swiss team has a French competitor, Syroco, employing a kitesurfing sail that actually lifts the vessel above the water. But it will be tethered to the water by a long fin below the surface that serves as a sea anchor. That team plans to up the SP80’s ante by sailing just a hair faster, at 80.99 knots (or 93.2 mph).