REGENT’s seaglider is designed to use the water differently at each stage: it floats on its hull near a dock, rides on retractable hydrofoils through port waters, then retracts those foils for near-water ground-effect flight. After landing, it can deploy the foils again to reach a terminal. REGENT describes features intended to manage choppy water, but its public passenger Viceroy page does not state a certified sea-state limit for passenger service.
How a seaglider moves between a dock and flight
The operating sequence is float, foil, fly—and the reverse when arriving. Close to a dock, the craft rests on its hull. As it accelerates, submerged hydrofoils lift it above the water; the foils retract for flight in ground effect close to the surface. Following a water landing, the foils can be redeployed for the trip to the terminal. REGENT describes this sequence on its Viceroy product page.
That sequence matters in a harbor because the craft does not have to fly from berth to open water. REGENT says the hydrofoils support maneuverability in ports. Siemens’ 2022 account of the design describes foiling into and out of port at up to 40 knots; that is a vendor-reported design figure, not a current, verified operating limit for a passenger route. Siemens’ account
What the hull and hydrofoils do in choppy water
Hydrofoils lift the craft above surface chop
In its account of a full-scale prototype test in August 2025, REGENT said carbon-fiber foils extended below the surface and lifted the Viceroy about five feet above the waterline. The company said digital controls adjust foil position to maintain altitude. The lift is intended to place the craft in calmer water beneath surface chop; the description is REGENT’s account of its own test campaign, not an independent ride evaluation. REGENT’s test-campaign account
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The deep-V hull handles water contact
The hull becomes important when the craft is floating, approaching a dock, or returning to the water. REGENT describes Viceroy’s pointed deep-V hull as enabling comfortable landings in multiple sea states. During landing, the foils retract as the hull re-enters the water. These are manufacturer descriptions of the design; the product page does not give a numerical passenger operating envelope. REGENT Viceroy
What wave conditions can a seaglider handle?
REGENT Defense advertises takeoff and landing in waves up to five feet, labeled Sea State 4. That statement is on the company’s defense capability page and concerns defense missions. It should not be treated as an approved wave limit for commercial passenger Viceroy service: the passenger product page does not confirm the same limit. REGENT Defense capability page
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The public sources cited here do not specify passenger-service limits for wind, current, visibility, harbor traffic, or wave height. Nor do they establish that the craft can use any harbor or operate in all rough conditions. Actual limits depend on the particular craft and its approved operating envelope.
Does prototype testing establish passenger-service readiness?
No. The milestones show prototype development, not routine all-weather passenger operations.
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| Date | Reported milestone | What it establishes |
|---|---|---|
| August 27, 2025 | REGENT said its full-scale Viceroy prototype had transitioned from hull mode to hydrofoil testing, lifting about five feet above the waterline and testing at around 20 mph while progressing toward higher foiling speed. | A company-reported prototype test milestone, not an approved passenger operating limit. |
| March 11, 2026 | REGENT said full-scale hydrofoil tests were continuing, with a first flight carrying people planned during 2026 and first customer deliveries expected in 2027. | Development plans at that date, not evidence of scheduled passenger service. |
| September 2, 2026 | REGENT announced the prototype’s first human-crewed flight. | A reported test flight, not proof that passenger service is operating. |
| Current operator plan | The Twenty Five says initial deliveries are scheduled for Winter 2027 and identifies Hornblower Group as exclusive maritime operator. | An operator’s forward-looking plan; delivery and service timing may change. |
Sources: REGENT, August 27, 2025; REGENT, March 11, 2026; REGENT, September 2, 2026; The Twenty Five FAQ.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to judge claims about rough-water capability
When assessing a claimed wave limit, check which version of the craft and which mission it covers, who published it, and whether it is a design statement, prototype result, or approved operating limit. A defense capability statement and a passenger-service limit are not interchangeable. For passenger Viceroy operations, the public page cited here describes the hull and foils but does not publish a numeric sea-state limit.
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