@edgarblythe,
Hydroplane sailboat.
I did hydroplane motor boats last time around, but these are fairly new developments in the design of racing yachts. I watched the America Cup race today, at least one leg of it, and these yachts are the most incredible, fastest sailboats that exist. There are four hydroplanes on each boat, and they are thin and produce very little drag. The hulls are totally lifted above the water. Double Hulls. England beat America today.