Read a magazine article recently (Popular Mechanics I think) and they were going on about the virtues of a hydrofoil boat: faster, 40-50% better fuel economy, smoother ride in chop and waves, etc. They made a really convincing case.
I'm talking about a true hydrofoil with a NACA-type airfoil shape that provides maximum lift vs drag - NOT those outboard anti-ventilation plate add-ons.
I'm thinking I'd like to have a partial hydrofoil under the new boat to at least lift me up out of the water a good bit and reduce my wetted area/drag.
Maybe mounted a few feet forward of the transom on a swing arm with a shear pin holding down a pivot that'll allow the foil to swing rearward and out of the water if I hit something.
I did a little google research and there's nothing really out there for power boats, trim tabs will lift up the back end of a boat pretty well, but the lift/drag ratios stink. I did find a company that had some surplus extruded aluminum airfoils - but they were only about 4 inches wide.