Foiling
I just visited San Francisco, CA to visit my grandparents. It just happens that they are hosting this years America's Cup. It is one of the oldest cups in history. It was really cool to see all the boats practicing for their races. They can go really fast! This is how they do it. If you watch sailing you might see foiling a little. When boats get to about 20 knots they can begin to foil. This is basically when the main body of the boat is out of the water and it is just being held up by a small surface. This is when the boat can reach its top speed. Here is a video showing some America's cup boats.