Since this is HN, let's add more technology. Keep the foil retracted until a sensor detects you're at an appropriate speed then extend the foil at a rate that maximizes velocity through the water. The weight added should be minimal.
Even better might be multiple foils along the hull at different depths. When the speed is low, you get lots of extra lift to help pull the hull out of the water. As you pick up speed, the extra foils come out of the water and don't create extra drag.
This is why I love this site :-)
Cool concept. Would it be possible to build a K2 or K4 like this to try and get even more speed?