An electric hydrofoil ferry could be the future of public transportation in Stockholm—and beyond.
The problem with powering any form of transport with electricity is it requires heavy batteries. That’s a particular problem for boats, as they suffer drag in the water. To address this Candela uses hydrofoils, legs that extend down into the water and act like wings, propelling the boat up into the air as it picks up speed like an aircraft during takeoff. “In harbor the foils are fully retracted, so they’re protected,” Hasselskog says.
A superfast flying boat sounds like a surefire way to lose your breakfast on the morning commute, but the Candela has sensors that feed into an automated control system to adjust the height and roll and pitch up to 100 times a second to ensure a smooth ride regardless of the weather. “Through the control system we can cut out any vertical movements of the boat,” Hasselskog says, which is what tends to cause seasickness. “So far nobody has gotten seasick on our boats.
Candela couldn’t simply upsize its existing boat to build the P-12—regulations require a thicker hull, fire safety systems for the batteries, and, confusingly, separate toilets for passengers and the single member of crew, who will be driving all the time. For coastal cities like Stockholm, ferries could become the watery equivalent of trams without having to lay infrastructure like rail, though charging systems will be needed. “If it’s acting like a sea-based light rail facilitating hundreds of people who would have gone by car, then that’s what we need more of,” says Paul Chatterton, professor of urban futures at the University of Leeds.
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