Can a Hovercraft Cross the Atlantic? The Seaspeed Precedent

Yes, It's Been Done

In 1971, the British SR.N4 "Seaspeed" hovercraft crossed the Atlantic from England to the USA in just over 3 days.

The Vessel

• Type: SR.N4 Mountbatten-class (largest civil hovercraft).
• Displacement: ~100 tonnes.
• Power: 4 × Rolls-Royce Proteus gas turbines (total ~9,600 hp).
• Speed: 60 knots (110 km/h / 68 mph) cruise.
• Capacity: 150 passengers + cars.

Advantages Demonstrated

• Speed: 3–4× faster than conventional ferries (15–20 knots).
• Seakeeping: Rides on air cushion—immune to wave motion, no seasickness.
• Draft: Zero—can land on any flat beach/slipway, no port needed.

Why They Didn't Replace Ships

• Fuel Cost: Gas turbines burn ~1,000 gal/hr. Extremely expensive vs. diesel ships.
• Range: Limited (~500–800 nm). Requires refueling stops (Azores, Newfoundland).
• Noise: Deafening (120+ dB). Environmental & community impact.
• Maintenance: Skirt wear, engine complexity, corrosion.
• Weather Limits: Can't operate in very high seas (wave height > cushion depth).

Future Potential

Electric/hybrid propulsion, advanced skirt materials, and autonomous tech could revive interest for niche high-speed routes (e.g., UK–Iceland, Mediterranean), but transatlantic hovercraft remain impractical for cargo/mass transit.