Looks like a Ground Effect Vehicle. They have been around for decades but never really took off (pun?)
When a plane is at altitude, there is so much air under the wing that the air can simply move out from under the wing. To get enough lift
, they have to go very fast to compensate.
At very low altitudes, the air gets trapped between the wing and the ground limiting it's ability to move out from under the wing. This results in higher air pressure under the wing, so you can use a combination of smaller wing and lower speeds to achieve sufficent lift.
The only slightly unusual thing about this is they use a propeller
in the water
rather than in the air. While most GEV can come completely clear of the water
, this one will eventually reach a limit when the props start coming out of the water.
I expect there is some truth to the efficency as the faster they go the more the hulls come out of the water...but I suspect this is based on smooth water. If there is significant wave action, it won't get the same ground effect and the hulls will keep hitting wave fronts. A GEV that uses a jet or airplane propeller
would have an advantage as they can get the hulls completely out of the water and literally fly just above most modest waves.
I don't buy the freight market tag as they would be very weight sensitive similar to aircraft. I could possibly see them competing against hydrofoil passenger ferry
designs that use a similar effect of lifting the hulls almost completely clear of the water.