REGENT's Viceroy Seaglider, the Twelve-Seat Electric Craft That Rides a Cushion of Its Own Air a Wingspan Above the Waves, and Why the Coast Guard, Not the FAA, Gets to Say Whether It Flies

REGENT’s Viceroy is a twelve-passenger electric “seaglider” that cruises about 30 feet above the water, riding permanently inside ground effect - and because it never climbs higher, it is being certified in the United States as a maritime vessel by the U.S. Coast Guard, not as an aircraft by the FAA. The craft launches from an ordinary dock, uses hydrofoils to get up to speed in rough water, then lifts onto a cushion of its own air for the cruise. Its legal identity as a boat is welded directly to the engineering decision to stay low.

What Is a Seaglider, and Who Is REGENT?

REGENT is a company based in North Kingstown, Rhode Island, founded in 2020 by two engineers from the electric-aircraft world, Billy Thalheimer and Mike Klinker. The name is an acronym: Regional Electric Ground Effect Naval Transport. That middle phrase - ground effect - is the entire concept.

The Viceroy is REGENT’s first craft. It has wings, a fuselage, and propellers, and to any pilot’s eye it reads as an airplane. But it ties up at a marina next to fishing boats, and it is designed never to leave the ground-effect bubble that hovers just above the surface.

What Is Ground Effect, and Why Does It Matter Here?

Every pilot already knows ground effect - you feel it in the flare. When a wing comes closer to the surface than about one wingspan, the wingtip vortices that normally spill off the wing and generate induced drag get squeezed and blocked from fully forming. Induced drag drops, and the wing suddenly becomes far more efficient, as if floating on a cushion.

That is the float that makes a Cessna want to keep flying just off the runway. Normally it’s a three-second nuisance we manage on landing. REGENT’s core idea is to live in those three seconds permanently.

By staying in ground effect, the Viceroy cuts its drag dramatically compared with flying at altitude. Less drag means less energy, and less energy is what allows a heavy, stingy battery to move a useful payload a useful distance. Ground effect is the trick that makes the batteries pencil out.

How Fast and How Far Can the Viceroy Go?

The figures REGENT quotes for the Viceroy:

12 passengers plus 2 crew
Cruise speed of roughly 180 miles per hour
Range of about 180 miles on today’s battery chemistry, with more expected as batteries improve

That makes it a coastal machine - city to city along a shoreline. Think Boston to Provincetown, Los Angeles to Catalina, the Hawaiian islands, or the Gulf coast: routes currently served by slow ferries or expensive helicopters.

How Does a Seaglider Actually Take Off? The Float-Foil-Fly Sequence

Ground-effect vehicles are not new. The Soviets built enormous ones during the Cold War, most famously the craft Western intelligence nicknamed the Caspian Sea Monster and the later military Lun. They were airliner-sized, skimming the water at hundreds of miles per hour carrying missiles - and they mostly failed for one brutal reason: waves. A craft that lands on its belly like a seaplane hull gets beaten to death the moment it hits chop, swell, or a wake. The old machines needed calm water and brute force.

REGENT’s answer is hydrofoils, and the Viceroy’s takeoff runs in three distinct phases:

Phase 1 - Float. It sits on its hull like a boat, tied to the dock. Passengers board from a normal marina - no runway, no airport, no long taxi.

Phase 2 - Foil. As it accelerates, hydrofoils - small underwater wings on struts - extend below the hull. Because water is far denser than air, these small foils generate enough lift to hoist the entire hull clear of the surface. The foils slice through chop instead of slamming into every wave, giving a smooth, stable platform to build speed in rough water. This is the same technology behind America’s Cup sailboats and electric hydrofoil surfboards - the missing piece the Soviets never had.

Phase 3 - Fly. Once foiling fast enough, the wings take over, the foils retract, and the craft lifts into ground effect at about 30 feet and settles onto its cushion of air. Landing runs the sequence in reverse: fly down onto the foils, foil down onto the hull, float up to the dock.

Float, foil, fly. The hydrofoil phase is what lets the Viceroy operate in wave heights that would have grounded every ground-effect machine before it.

What Are the Real Limitations?

Batteries and reserves. A 180-mile range with a meaningful reserve is a genuine constraint, and the reserve question is not trivial over open water. A battery-powered craft cannot dump fuel weight to get lighter, and it cannot divert to the nearest airport - because it doesn’t use airports. Its emergency options are the water below and the next dock. Proving out a robust reserve and diversion philosophy is harder over the ocean than over land.

Traffic and obstacles. Thirty feet over the water means sharing space with boats, buoys, fishing gear, swimmers near shore, and whales. A craft doing 180 mph has to see and avoid everything a boat does but with far less reaction time - and it cannot simply climb over a problem, because leaving ground effect throws away the entire efficiency advantage. REGENT is leaning heavily on sensors, detect-and-avoid systems, and defined operating corridors. That is an unsolved engineering and operational challenge.

Why the Coast Guard - Not the FAA - Regulates the Viceroy

This is the strangest part of the story, and it matters for pilots. In the U.S., anything with wings that carries passengers through the air normally falls to the Federal Aviation Administration. But a seaglider spends its entire life within a wingspan of the water, and under international maritime rules and U.S. Coast Guard interpretation, a wing-in-ground-effect craft operating in close proximity to the surface is classified as a maritime vessel - a boat.

So the Viceroy is being certified by the U.S. Coast Guard through the maritime process. Its operators will hold mariner credentials - captain’s licenses - not airman certificates.

REGENT favors this path because maritime certification is more established and, in some ways, more predictable for a brand-new vehicle type than inventing a new FAA aircraft category from scratch, the way eVTOL companies are grinding through now. The Coast Guard has certified novel high-speed vessels before, so there is an existing framework - arguably a faster route to market.

The deeper point: this is regulatory arbitrage built into the physics. The craft is a boat specifically because it refuses to climb. Take it up to 1,000 feet and it becomes an airplane under the FAA. Its legal identity is tied to its altitude - a vessel at 30 feet, an aircraft at 300.

Why This Matters for Pilots

If you operated a Viceroy, you would step into a completely different world layered on top of hardware that looks like an airplane. You would not file an instrument flight plan or talk to approach control. Instead, you would follow the maritime rules of the road - the same collision regulations that govern ships. You would answer to the harbormaster, not the tower.

Where Does REGENT Stand Today?

REGENT is the clear front-runner in the West and has built real credibility. As of August 2026, the company has:

Flown a quarter-scale prototype
Built and tested a full-scale twelve-passenger Viceroy prototype
Announced a defense variant, of interest to militaries wanting to move troops and cargo between islands - low, fast, quiet, and off the radar of anything expecting either a boat or a plane
Collected a large book of provisional orders from ferry operators and airlines in coastal markets from Hawaii to the Middle East to Japan
Begun talking about a larger sibling, the Monarch, a roughly 100-passenger seaglider for later this decade

One caution: provisional orders are not revenue. An order announcement is a press release, not a certified craft carrying paying passengers - and the electric-aviation world has watched plenty of flashy order books evaporate.

When Will Seagliders Carry Passengers?

REGENT is targeting commercial passenger service in the second half of this decade - roughly 2026 to 2028 for initial operations. As with any first-of-its-kind passenger vehicle, expect that timeline to slip; new vehicle categories rarely hit their first dates exactly.

The Bigger Picture

The seaglider is one of the more intellectually honest ideas in the future-of-flight conversation. Most electric-aircraft startups are fighting physics - asking batteries to haul mass up to altitude and keep it there, a job batteries are bad at. REGENT isn’t fighting physics; it’s exploiting a loophole in it. Ground effect is free efficiency, and instead of spending three seconds in it per landing, REGENT built a whole vehicle that never leaves it.

The hard parts are real - batteries, reserves over water, traffic avoidance, and proving that maritime certification can deliver the safety record passengers deserve at 180 mph. But those are engineering and operations problems, not physics problems. That is the difference between a company that might make it and a rendering that never will.

Key Takeaways

REGENT’s Viceroy is a 12-passenger electric seaglider that cruises at about 180 mph for roughly 180 miles, flying permanently 30 feet above the water in ground effect.
Ground effect cuts drag enough to make battery propulsion practical - the efficiency gain is the entire reason the craft works.
A three-phase float-foil-fly sequence uses hydrofoils to build speed smoothly in rough water, solving the wave problem that doomed Soviet ground-effect craft.
Because it never leaves ground effect, the Viceroy is certified as a maritime vessel by the U.S. Coast Guard, not the FAA; operators hold captain’s licenses and follow maritime rules of the road.
REGENT has flown scaled and full-scale prototypes and is targeting commercial service in 2026–2028, with a larger ~100-passenger Monarch planned later this decade - though provisional orders are not yet revenue.