These are links to Boat Racing things [above]
Boat racing is a sport in which boats, or other types of watercraft, race on water. Boat racing powered by oars is recorded as having occurred in ancient Egypt, and it is likely that people have engaged in races involving boats and other water-borne craft for as long as such watercraft have existed. Jetsprint or sprint boat racing is a form of racing sport in which jetboats, with a crew of two, race individually against the clock through a twisting series of channels in less than a metre of water
There are three broad categories of boat racing which define how the watercraft are powered. Self-propelled, human powered boats; wind (sail) powered boats; and motorised, frequently referred to as motorboats or powerboats. A jetsprint hull is typically short - just 3.8 to 4.0 metres (12½ to 13 feet) long. The hull's vee is usually 23 to 25 degrees with several strakes on each side. A short hull is preferred, as a longer hull takes more distance to turn and usually must be turned at a slower speed. The strakes provide "traction' by stopping the boat from sliding sideways across the water when turning at high speed. A rollcage must be fitted to the boat. Group A - engines in Group A boats are restricted to either 6.7-litre (412 cubic inch) engines with cast iron blocks and heads, or 6-litre (365 cubic inch) engines with aluminium heads. Both engines are only allowed two push-rod operated valves per cylinder. Furthermore, the engine must be normally aspirated, using a four-barrel carburetor. Fuel is 100+ octane aviation fuel. Typically these engines produce up to 650 horsepower Super Boats - engines in the Super Boat class have no maximum size, but instead have a minimum size restriction. Normally aspirated engines must have a displacement of 6.5 litres (400 cubic inches), while forced induction (turbocharged or supercharged) engines must be at least 3.8 liters (235 cubic inches) in displacement. These engines typically are fuel injected and run methanol fuel. The small-block engines typically produce 950+ horsepower, while the big blocks can produce between 1000 and 1600 horsepower. Nitromethane and nitrous oxide are not allowed
Jetsprinting as an organised sport originated in New Zealand in 1981, and events were originally held in the same natural braided rivers that had inspired Sir William Hamilton to develop the jetboat, but when the sport was introduced to Australia in the mid-1980s, permanent artificial courses were used—and this is now the norm even in New Zealand. There is now a world championship under the auspices of the Union Internationale Motonautique, with hosting rotating between New Zealand, Australia and the U.S.A