In Hawai'i I see hydrofoils more and more. The way they move looks to me like there's a significant (2x+) advantage in efficiency (and smoother ride). So I'd ex

In Hawai'i I see hydrofoils more and more. The way they move looks to me like there's a significant (2x+) advantage in efficiency (and smoother ride). So I'd expect "The Next Generation of Boats" to have a hydro foil. I'm a complete layman though, so could be wrong. Can anyone answer whether modern hydrofoils are a game changer?