All-electric seaglider manufacturer Regent Craft will deliver its first 50-100-passenger Monarch seaglider to United Marine Egypt (UME) Shipping before the end of the decade.
The vessel is an all-electric hydrofoiling wing-in-ground (WIG) craft, which means it always operates in ground effect, an operation that occurs within one wingspan of the surface of the water and provides increased aerodynamic efficiency, enabling it to travel further on a single charge.
The Monarch seaglider will travel up to 650km at 225km/h with 50-100 passengers or a 10,000kg payload. The Viceroy seaglider will travel up to 300km at 300km/h with 12 passengers or a 1,600kg payload.
UPDATE : New article considers the potential of larger wing in ground effect planes like previous DARPA liberty lifter and Boeing Pelican designs updated with Regent Craft technology.
A hybrid version of the Monarch could have about 2000 miles of range. In ground effect, induced drag drops by 40-50% due to the “air cushion” between the wing and water, boosting lift-to-drag ratios to 20-30 (versus 15-20 for conventional aircraft in free flight). Larger vehicles amplify this efficiency via the square-cube law: as size increases, volume (payload capacity) grows faster than surface area (drag), reducing energy per ton-mile. Regent’s digital controls scale without adding proportional weight or complexity, unlike mechanical stabilizers in past WIG. Combined with electric propulsion, operational costs could be 30-50% lower than ferries or aircraft for coastal routes, while speeds of 140-180 mph make them 5-10x faster than cargo ships (typically 15-25 mph).
This expansion aligns with Regent’s broader vision for regional coastal transportation, including partnerships like Hawaiian Airlines for 100-seat island-hopping services.
Flying in ground effect unlocks incredible aerodynamic efficiencies, but for decades, it’s been a notoriously difficult regime to operate in—prone to instability and hard to control. Earlier attempts at wing-in-ground effect vehicles, like the Soviet-era ekranoplans, tried to brute-force stability through unconventional wing designs at the expense of efficiency.
The challenge of flying in ground effect
In most airplanes, WIGs included, the tail “lifts” downwards. Think of the airplane or WIG like a see-saw with the pivot on the center of gravity (by the nose). The more the tail pushes downwards, the more the nose rises.
The more an airfoil (like a wing, or a tail) turns the airflow, the more lift it creates. The angle between the line drawn from the nose to the tail of the airfoil (the “chordline”), and the incoming air, is called the angle of attack. The greater the angle of attack, the more the air foil turns the air, and the more lift it generates. This is why an airplane pitches its nose up to takeoff: it increases the angle of attack on the wings to generate enough lift to leave the ground.
When an airplane enters ground effect, the downwash is reduced. The ground gets in the way of the downwash and keeps the airflow straighter. This is what decreases drag and makes ground effect so efficient.
We lowered our altitude to enter ground effect, and then our nose goes down. This leads us to descend even more, which makes the ground effect stronger, which reduces the wing downwash on the tail even more, which reduces the tail downforce even more, which makes the nose go down even more — eventually, all the way into the ground. This is called ”instability” and was very challenging for early WIG captains and designers.
3 early WIG designs
There have been three kinds of WIG design before the Seaglider one — all of which attempted to fix this instability issue with wing design.
The ekranoplans used (A), basically trying to separate the wing and tail absolutely as far as possible so the ground effect and wing downwash would not affect the tail. This led to very heavy designs because so much structural reinforcement was required to build these giant tails so far away from the main wing.
Other types of WIGs used the reverse-delta (B) or the tandem-wing (C). In both cases, it works the same with upwards lift being ahead of the center of gravity see-saw.
The ekranoplan design (A) leads to a really, really heavy WIG, and designs (B) and (C) lead to inefficient ones, which defeats the whole purpose of ground effect.
The Seaglider solution
Regent Craft does not need to fix instability with wing design anymore. There are now advanced digital flight control systems that can control even unstable vehicles. REGENT Seaglider vessels use digital control systems to protect their flight envelope and ensure safety in all cases.
Wing in Ground Effect Does Scale Well to Larger Sizes
Apeeds would remain 140-200 mph, vastly outpacing ships while consuming 50-70% less energy per ton-mile than aircraft due to WIG. Challenges include port infrastructure for mega-sizes and regulatory hurdles, but efficiency gains could cut global shipping emissions by enabling coastal “WIG highways.”
Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
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Technically and legally, it’s a boat. The lead designer presented before our group, the Rhode Island pilots Association, last year. Sure, there could be rogue wave potential, but how about the much more common and realistic problem of only being able to takeoff with a load in calm water. What happens if you have an emergency in an area where the waves are 4 feet, and you have to stop, fix something, and then go again. It’s not going to happen, because there’s no way to get up to speed with passengers, maybe without passengers even, unless you have calm water. That doesn’t sound like a very intelligent boat to me. Actually, I would be concerned in its ability to even float safely in 4 foot waves!! Their facility is only half an hour away from me, and I can’t wait to see it actually fly with a load, but I’m not holding my breath. We should all be asking them this question.
The larger 100 passenger version will be able to go over taller waves. The wing in ground effect planes can go higher but then they give up the efficiency of being close to ground or water.
This is what I’ve been saying, in response to all the supersonic and hypersonic passenger plane talk: What we need aren’t faster expensive passenger planes, but instead fast enough *cheaper* passenger planes. And ground effect airplanes looked to me like the way to achieve this.
Ground effect planes look like a rogue wave disaster with hundreds of deaths. Obviously avoid at all costs. Put the venture capital into moar AI.
Unclear why we need cheaper passenger planes. I mean, it would be nice, but I don’t think the current price of aviation is the bottleneck in any real industry. We’ve had decades of free market competition to lower the price, and this is where we’ve gotten to. Supersonic, in the other hand, can open up new markets and industries that couldn’t have existed before.
[ comparable hope was coupled with the model A380 for pushing the infrastructure, but it seems, that planes that size are above the ‘optimum’ for ‘this planet’s’ physics and peoples ‘needs'(?)
(what includes that ‘we’ are at the top (or over) of ‘maximum oil/gas(?)’ for stored fossil fuels (from solar energy input over thousands/million of years, and the ‘cheap’ access to stored fuels will be limited through lower EROI-fuels, what costs development force and will support, yes, ‘elegant solutions’ instead of masses for the solution(?), until ‘we/humanity’ reaches climate neutral fusion for electricity)
It’s an interesting question, about the safety/risk of ground effect planes and estimations/projections (or modelling, including AI) on that(?) (thx) ]