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A jetboat is a boat propelled by a jet of water ejected from the back of the craft. Unlike a powerboat or motorboat that uses an external propeller in the water below or behind the boat, a jetboat draws the water from under the boat through an intake and into a pump-jet inside the boat, before expelling it through a nozzle at the stern .
Jetsprint or sprint boat racing [1] is a form of motorboat racing 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.
Sir Charles William Feilden Hamilton OBE (26 July 1899 – 30 March 1978) was a New Zealand engineer who developed the modern jetboat, and founded the water jet manufacturing company, CWF Hamilton Ltd. Hamilton never claimed to have invented the jet boat. He once said "I do not claim to have invented marine jet propulsion.
The first New Zealand Drag Racing Nationals was held in the 1966/67 season at Kopuku, near Auckland. There are now two governing bodies operating drag racing in New Zealand with the IHRA sanctioning both of New Zealands major tracks at Ruapuna (Pegasus Bay Drag Racing Association) in the South Island and Meremere Dragway Inc in the North Island.
The boat was built to race in the Pennant Class and was named Cherub. Its superiority over other designs in the Pennant Class was immediately evident. Within a very short period of time a number of boats were racing in Auckland. A New Zealand class owner's association was established in 1952. [3]
It is popular as a craft for teaching beginner sailors, and is used in races in New Zealand. Although designed as a two-person boat, a Sunburst can easily be sailed by a single person in light to moderate conditions using just the mainsail only, or mainsail and jib. The Sunburst is usually rigged with a mainsail, jib and spinnaker.
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The Royal Navy - and associated Commonwealth navies such as the Royal Australian Navy, Royal New Zealand Navy - used the whalers until the 1960s. They were used for service, training and recreation. Whaler races were organised between ships and ports; minor royalty often handed out the trophies. [1]