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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.
Margaret spectated jet boat Marathons which Pat competed in, but wanted to see more of the race, suggesting a smaller, more condensed track. 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 ...
The boat was reported to reach a speed of four mph moving upstream. [7] [8] [9] On December 21, 1833, Irish engineer John Howard Kyan received a UK patent for propelling ships by a jet of water ejected from the stern. [10] In April 1932, Italian engineer Secondo Campini demonstrated a pump-jet propelled boat in Venice, Italy. The boat achieved ...
Walters, Sydney David (1956) The Royal New Zealand Navy: Official History of World War II, Department of Internal Affairs, Wellington Online; McDougall, R J (1989) New Zealand Naval Vessels. Page 37–48. Government Printing Office. ISBN 978-0-477-01399-4; Royal New Zealand Navy Official web site
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.
A Short Sunderland MR5 of the Royal New Zealand Air Force, displayed at the Museum of Transport and Technology in Auckland. The Short Sunderland was developed as a long range maritime reconnaissance flying boat and was widely used during the Second World War.
Each "Formula" level follows a different set of regulations that specify the design of the boat and engine, as well as the rules of competition. The most common form of inshore powerboat racing involves a race around a two pin (buoy) or multi-pin circuit of approximately 1.5 – 2 km in length. Each pin marks a turn in the course.
Typical racing speeds are over 30 knots (55 km/h, 34 mph) with the boats capable of sailing well over 40 knots (74 km/h, 46 mph) in the right conditions. The fastest race speed recorded was on Emirates Team New Zealand which was 47.57 knots (88 km/h, 55 mph) in 21.8 knots of wind (2.2 times the wind speed) on September 24, 2013.