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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →A hydrofoil ferry uses underwater wings to lift its hull clear of the water once it has enough speed. With less hull dragging through the water, resistance falls, making fast travel more practical for an electric vessel. The lift is not free: the motor still has to propel the ferry, while a control system continually adjusts the foils to keep the boat stable.
How does a hydrofoil lift a ferry?
A hydrofoil is a wing mounted beneath the hull. As the ferry moves forward, water flows around the foil; its shape, angle and the flow of water create an upward hydrodynamic force called lift. Bernoulli’s principle helps describe how pressure differences around a foil contribute to lift, though it is not the only part of the physics.
At low speeds, the hull stays in the water. As speed increases, the foils generate more lift. Once lift is sufficient to raise the hull, much less of the boat is moving through the water. That reduces frictional and wave-making drag. The electric motor still supplies energy to move the vessel and lift it; foiling reduces the resistance the ferry encounters rather than eliminating the energy cost.
How does the ferry stay stable above the water?
A fully submerged foil system responds to changes in speed, pitch, roll and waves. The ferry therefore needs active control, not just wings. Sensors monitor the vessel, and a flight-control system continually adjusts foil settings to help maintain a stable ride.
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Candela says its P-12 flight-control system uses more than 10 sensors. The company also says its foils generate enough lift to raise the hull at 16 knots. These figures describe Candela’s system, not a threshold or sensor count that applies to every hydrofoil ferry. Candela’s technology overview
In a 2025 account of its work with DNV, Candela described a qualification scenario in which the flight computer was unplugged while the vessel was foiling. According to the company, water pressure moved the foils to a neutral position and the ferry settled back into the water. That is Candela’s description of a safety scenario, not an independent test result. DNV’s involvement in the technology-qualification process is relevant, but it does not establish that every local approval or certification is complete in every jurisdiction. Candela’s 2025 account of the qualification process
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What the Candela P-12 specifications show
The P-12 Shuttle is one example of an electric hydrofoil ferry; its specifications should not be treated as representative of every vessel. Candela’s current product page lists the following figures for the P-12 Shuttle configuration:
| Specification | Manufacturer-listed figure |
|---|---|
| Service speed | 25 knots |
| Range at service speed | Up to 40 nautical miles |
| Capacity | 30 passengers plus one crew member |
| Propulsion | Two C-Pod motors, each rated at 110 kW continuous and 160 kW peak |
| Battery | 378 kWh nominal; 336 kWh usable |
| Maximum charging power | Up to 300 kW DC |
| Designed significant wave height | 1 metre when foiling; 2 metres when not foiling |
These are manufacturer specifications, not independently verified operating results for every route, load or set of conditions. In particular, the range figure is stated at the listed service speed; it should not be confused with a demonstration journey involving stops. Candela P-12 Shuttle specifications
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How fast has an electric hydrofoil ferry gone in service?
The Associated Press reported that the P-12 Nova entered Stockholm public transport in October 2024. On the reported route from Ekerö to Stockholm City Hall, it carried 25 passengers and covered about 15 kilometres in roughly 30 minutes. AP said the conventional diesel ferry made the trip in 45 minutes without stops. The report put the Nova’s cruising speed at around 25 knots and its maximum speed at 30 knots. Those figures describe that vessel and service, not a universal electric-ferry timetable or speed. Associated Press report on the Stockholm service
Candela reported a separate Gothenburg-to-Oslo demonstration journey of 160 nautical miles over three days in 2026, with stops. That demonstration is distinct from the P-12 Shuttle’s listed range of up to 40 nautical miles at service speed; it should not be read as a single-charge service-range figure. Candela’s 2026 demonstration account
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Why can foiling reduce energy use and wake?
When the hull rises, less of it pushes through the water, so drag falls. That can make higher-speed travel more practical for a battery-powered ferry than driving a conventional displacement hull at the same speed. A lower wake may also matter on urban waterways, where wake can contribute to shoreline erosion and create hazards for other vessels.
Candela has reported an 80% reduction in energy use compared with conventional vessels. AP also reported an 80% comparison attributed to the company. This is a manufacturer-reported comparison, not an independently verified universal saving. The result depends on the vessels being compared, route, speed, passenger load, operating pattern and selected baseline. Candela’s 2025 account of its energy-use claim
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AP reported that Stockholm’s P-12 Nova was exempt from a local 12-knot limit because it left no wake. That was a policy decision reported for a specific vessel and route; it does not give hydrofoils a general right to disregard speed restrictions. Associated Press report on the Stockholm service
What to compare when evaluating hydrofoil ferries
Top speed alone is a poor basis for comparing ferries: a maximum-speed figure and a scheduled service speed describe different things. For a useful comparison, check:
Quick Recap
- Route performance: scheduled journey time, stops and service speed on the route you care about.
- Capacity and payload: passenger count and any limits that change with load.
- Range conditions: the stated speed and operating conditions behind the range figure.
- Energy claims: the named comparison vessel or baseline, and whether the result is independently measured or company-reported.
- Charging and turnaround: charging power as well as the time and infrastructure needed between trips.
- Waterway fit: wake, local speed rules and the vessel’s wave limits while foiling and while operating hull-down.
- Safety and approvals: how the control system handles faults and which approvals apply to the vessel and operating jurisdiction.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
