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Boat Racing
Jet Sprint Boat racing is a form of racing sport in which speed boats, usually carrying a crew of two, powered by water jet propulsion rather than by conventional propellers, race around watercourses consisting of a number of interconnected channels 3 to 5 meters wide with a water depth of 1 meter.
A jetsprint course typically consists of several channels interconnected by cross channels and curved sections. Often these channels join the main channels at angles other than 90 degrees while the curved sections can be either sweeping or very tight.
The race itself will consist of a predefined course through the channels with 25 to 30 changes of direction. These races generally take between 45-60 seconds.
Once qualifying is completed the competitors each run the course with the fastest qualifiers running last. The fastest 16 (typically depending on the number of competitions) proceed to the next round. This is then reduced to the top 8, then the top 4 and then the fastest two.
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 aluminium heads. Both size engines are only allowed 2 pushrod operated valves per cylinder. Furthermore the engine must be normally aspirated, using a 4 barrel caburettor. Fuel is 100+ octane aviation fuel. Typically these engines produce up to 800 to 1000 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+ horspower while the big blocks can typically produce between than 1200 to 1500 horsepower.
Nitromethane and nitrous oxide are not allowed.
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