Regent and the Viceroy seaglider that flies inches above the water on an electric cushion of speed

Regent, a Rhode Island-based startup, is building something that defies easy categorization: the Viceroy, a twelve-passenger electric vehicle that operates as a boat, a hydrofoil, and a ground-effect aircraft in sequence. By flying just fifteen to twenty feet above the water at 180 mph on battery power alone, the Viceroy sidesteps the two biggest problems in electric aviation — limited range and massive infrastructure costs. No runway. No terminal. Just a dock.

What Is a Seaglider and How Does It Work?

Regent calls the Viceroy a “seaglider,” and it operates in three distinct modes. First, it functions as a conventional hull-borne vessel, sitting in the water and pulling away from a dock at low speed. Second, hydrofoils extend below the hull and lift the craft out of the water, dramatically reducing drag — the same principle used in America’s Cup racing sailboats. Third, the vehicle accelerates into wing-borne flight in ground effect, flying entirely on aerodynamic lift just above the water’s surface.

Ground effect is the same phenomenon general aviation pilots experience when a Cessna 172 floats down the runway during landing. Close to a surface, a wing’s downwash and wingtip vortices are suppressed, producing 40 to 70 percent more efficiency than flight at altitude. Regent’s entire business model is built on exploiting that physics advantage.

Why Ground Effect Solves the Electric Range Problem

The fundamental constraint on battery-powered aircraft is energy density. Jet fuel carries roughly 43 times more energy per kilogram than the best lithium-ion batteries available today. That ratio explains why most electric aircraft have ranges measured in tens of miles.

Ground-effect flight changes the math. By staying within one wingspan of the surface, the Viceroy’s lift-to-drag ratio improves enough to carry up to twelve passengers plus two crew for approximately 180 miles on a single charge. Compare that to most eVTOL air taxi companies, which target 60 to 100 miles of range. The Viceroy nearly doubles their numbers.

The reason is straightforward: it never hovers. Hovering is the most energy-intensive operation for any rotorcraft and devastates battery life. By transitioning from boat to hydrofoil to ground-effect flight, the Viceroy avoids the hover penalty entirely.

Who Founded Regent and What’s Their Background?

Regent was founded in 2020 by Billy Thalheimer and Mike Klinker in North Kingstown, Rhode Island. Thalheimer came from Aurora Flight Sciences (acquired by Boeing), bringing expertise in autonomous systems and advanced aircraft design. Klinker contributed marine engineering experience. The Viceroy sits precisely at the intersection of those disciplines.

The company has raised over $100 million in funding and secured letters of intent and conditional orders from regional airlines and ferry operators, including a notable partnership with a Hawaiian airline for interisland routes.

How Will the Viceroy Be Regulated?

The Viceroy creates a genuine regulatory puzzle. It is not an airplane and not a boat — it is both. In the United States, the Coast Guard regulates vessels while the FAA regulates aircraft. A vehicle that docks at marine terminals, navigates waterways, and also flies near coastal airports sits in both jurisdictions.

Regent’s strategy is to pursue initial certification as a maritime vessel under Coast Guard rules, using an existing International Maritime Organization classification called a Wing in Ground effect (WIG) craft. These vehicles have precedent — the Soviet Union built enormous WIG craft called ekranoplans during the Cold War, including the famous Caspian Sea Monster.

The maritime regulatory pathway is potentially much faster than FAA type certification. The Coast Guard has experience certifying high-speed craft, and the WIG category already exists in international maritime law. However, open questions remain about operations near shipping lanes, busy harbors, and controlled airspace around coastal airports.

What Are the Viceroy’s Engineering Advantages?

The propulsion architecture uses distributed electric propulsion — multiple smaller motors and propellers rather than one or two large ones. This provides critical redundancy over water; if one motor fails, others compensate.

The vehicle features a high-aspect-ratio wing designed specifically for ground-effect efficiency, with slightly curved wingtips to manage vortex behavior near the surface. This differs from wings optimized for higher-altitude flight.

A practical advantage of the seaglider concept is that weight penalties are less severe than in traditional aircraft. A heavier airplane needs a longer runway and burns more fuel climbing. A heavier seaglider simply sits deeper in the water at low speed, but once on foils and then on wing, ground effect helps compensate. There is no energy-expensive climb to cruise altitude.

What Are the Limitations and Risks?

Weather is the most significant constraint. Ground effect requires a relatively smooth surface beneath the vehicle. Calm water works beautifully. Six-foot swells do not. Flying higher to clear rough seas eliminates the efficiency advantage that makes the concept viable.

Regent has acknowledged the Viceroy will initially be a fair-weather vehicle, operating on coastal and intercoastal routes where conditions are predictable: island hopping in Hawaii, Puget Sound ferry routes, or connections like Boston to Provincetown and Miami to the Keys. Whether the operational weather window is wide enough to sustain a viable business remains an open question — though ferries and small aircraft face similar weather constraints.

Technology maturity is another consideration. Regent has flown a quarter-scale prototype demonstrating all three operating modes, including the transitions between them. Those transitions — managing hydrodynamic and aerodynamic forces simultaneously as the vehicle changes its relationship with the water surface — represent the hardest engineering challenge. However, a quarter-scale demonstrator is not a full-scale, passenger-carrying, commercially certified vehicle. That gap is where many startups fail.

Regent has targeted commercial service around 2028. Given the industry-wide pattern of timeline delays in advanced air mobility, a realistic expectation adds a year or two.

Why This Approach Stands Out in Electric Aviation

In a field crowded with eVTOL companies all attempting to solve urban air mobility the same way, Regent asks a fundamentally different question: what if the vehicle simply never climbed? Ground effect extends range. Water operations eliminate airport infrastructure requirements. Maritime regulation may be faster than aviation certification.

The competitive landscape includes a handful of other ground-effect vehicle startups globally, but Regent is arguably the most advanced in the Western market. Their design philosophy favors conventional appearance — the Viceroy looks like a small airplane with a boat hull — which simplifies manufacturing, makes maintenance more familiar, and eases public acceptance.

Key Takeaways

• The Viceroy exploits ground-effect physics to achieve roughly 180 miles of electric range — nearly double what most eVTOL companies promise — by eliminating hovering and staying close to the water’s surface.
• Maritime regulation offers a faster path to commercial service than FAA certification, using the existing WIG craft classification with Cold War-era precedent.
• Weather dependence is the primary operational constraint, limiting initial routes to calm coastal and intercoastal waters in predictable climates.
• A quarter-scale prototype has demonstrated all three modes (hull-borne, foil-borne, wing-borne), but the leap to a full-scale, certified, passenger-carrying vehicle remains the critical challenge.
• The infrastructure advantage is significant: the Viceroy needs only a dock, not a runway, taxiway, or terminal, potentially unlocking routes that airports cannot serve.