High speed on water -Jet sprinting

The Jetboat was invented in New Zealand by Sir William Hamilton. Jetsprinting as an organized sport originated in New Zealand in 1981 and was introduced to Australia in the mid 1980's.
This quickly resulted in a trans-Tasman championship and when the sport was introduced to the United states of America a three way world championship was introduced. The championship rotates between New Zealand, Australia and the U.S.A.

Jet sprint boats are extremely quick, 0 -100MPH in a little over 3 seconds.

There are two internationally recognized classes

Class A - Engines in Class 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 aluminum heads. Both size engines are only allowed 2 pushrod operated valves per cylinder. Furthermore the engine must be normally aspirated, using a 4 barrel carburettor. Fuel is 100+ octane aviation fuel. Typically these engines produce up to 650 horsepower
Superboats - Engines in the superboat 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 inch) or while forced induction (turbocharged or supercharged) engines must be at least 3.8 litres (235 cubic inch) 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 typically produce between 1000 to 1400 horsepower.
A jetsprint hull is a typically 4 to 4.5 metres (13 to 15 feet) long. The hull's vee is usually 21 to 23 degrees with several strakes on each side of the hull. A short hull is preferred as a longer hull takes more distance to turn and usually must be turned at a slower speed. Thew strakes provide "traction' by stopping the boat sliding sideways across the water when turning at high speed.

A jetsprint boat crew consists of two people. These are the driver, whose responsibility it is to steer the boat. Beside the driver sits the navigator, whose responsibility is to guide the driver through the course.
The navigator guides the driver via simple hand signals, pointing the hand in the direction that the boat must go at the next intersection or indicating the direction of a turn. If there are more than closely spaced turn the navigator will usually indicate the direction of the turn/corner by visibly raising and lowering their hand.

Generally international jetsprint events are now held in a permanent course. This course usually takes place in a bowl as this allows all the water expelled by the jet to return to the course.
Nitromethane and nitrous oxide are not allowed.
New Zealand drivers have tended to dominate the championships in both classes although both U.S and Australian drivers are becoming more of a threat to New Zealand's dominance of the sport.