@stavvers TBF this is a GOOD idea purely in engineering terms: kites can take advantage of wind speeds and directions that vary at different altitudes, aerofoils bolted to the deck on rigid masts are limited to surface winds. But it's still only a supplement for engine power: modern supply chains can't cope with VLCSs getting becalmed.

The real answer is marine nuclear propulsion. Or teleportation booths. Or sparkly unicorns. Or something.