The current World Unlimited Water Speed Record is 318 mph (511 km/h) and was set in 1978 by Ken Warby. His boat was the first to ever go past 300 mph and not crash. Up until that time, all the record breakers were American, Canadian, Irishman, or British and Ken was the first Australian. Although the World Unlimited Water Speed Record is the current fastest worldwide water record, there have been many other water speed records before the World Unlimited Water Speed Record. Before 1911 all the fastest speeds were achieved by steam-powered or propeller-driven vehicles. Since 1940 the approximate failure, or death rate of those attempting the unlimited record is 85%! The rules for the World Unlimited Water Speed Record include taking two runs in opposite directions, to make the speed official, because of wind variables or chop. Ken’s first run was an astonishing speed of 307.18 mph and his second run was 328 mph, with the official record equal to the average of 317.59 mph. Since then there have been two attempts at breaking the record, and they have both been fatal, showing how high the risk is. Ken was the only man to design, build, and drive a boat to the ultimate speed while the previous record holders had other people build or drive their boats. here