OK, so this does not have anything to do with kiteboarding other than these guys are using the wind to haul some serious ass. These boats can do like 36 knots in the right conditions, under sail power. Check out these photos:
Race 1:
http://www.americascup.com/en/multimedi ... idIndex=77Race 2:
http://www.americascup.com/en/multimedi ... idIndex=81