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18.05.2021, adminJoin thousands of others who share a common interest in jet boating. See photos and reports of buliders boating around the world, share your experiences, get tips and advice from industry experts. There are a mountain of benefits in being a member of JBNZ.
Its an organisation set up by jet boaters and run by jet boaters for the benefit of its members and others who gain the flow on benefit of the work we do in keeping New Zealand rivers open for use jet boat builders nz web 5 knots. The Jet Boating New Zealand Heritage Trust was formed to help coordinate and support the efforts of all those interested in jet boat builders nz web the history of jet boating for future generations.
We work hard to promote safety and enjoyment for all jet boaters and continue to uplift speed restrictions on rivers while lobbying to retain access for our members. Please log your river runs. Powered By. Click here to register for the National Rally National Rally builddrs Quarterly JET Magazine.
Training from jetboating experts. JBNZ stickers. All racing information. Member discounts and offers. Rivers map. Access to family river events. Boat Registration Letters. JBNZ would like to acknowledge the support of the following organisations for their support in various mediums over the last twelve months.
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This modernization came two years before the government constructed the first operational hydro-electrical station in Bill Hamilton as a young boy on a hunting trip, Ashwick Station ca. He found urban life in Christchurch life tiresome, away from the open potential of the alpine rivers but his separation from the Mackenzie country would not last long. The new purchase would become the site of the workshop where he incubated his many inventions.
The lack of suitable machinery for developing the farm prompted him to buy his first lathe, and then to build a larger workshop. In , Hamilton erected his own dam to generate electricity for his workshop and farm machinery for developing, and, when this dam was damaged, he built a larger one using an earth moving machine he designed and built for the purpose.
During the s Bill became fascinated with the new sport of motor-racing and purchased a Bentley racing car on a trip to England in and began racing competitively. Back home, Hamilton won the 50 mile New Zealand Motor Cup in , and went on to claim the Australasian speed record in he was the first person in the Southern Hemisphere to officially clock over mph. In he took his Bentley to England for the Brooklands Easter meet where he won all his races � the first driver to do so.
The Depression years saw Hamilton design and build a myriad of machines for a living. Raw materials were brought into Irishman Creek and engineered into finished products: a shingle loader, several scoops for earthmoving, a hay lift, a water sprinkler, an air compressor, an air conditioner, and others.
The scoops were to be a saviour in the tough years as wool prices plummeted, being used the length of New Zealand to carve out airports and roads they were later manufactured under license in Britain. During World War II the factory produced precision munitions such as Bren gun firing pins that required very accurate engineering. The workshop at Irishman Creek during the mid s. A lack of power supply hindered further development and after World War II, Hamilton opened an engineering business in Christchurch.
He helped design and build the first rope ski tow in New Zealand, and in at the age of 52, he revisited his boyhood idea of creating a boat that could travel upriver with ease and would be able to navigate the shallow waters around his Station. Bill Hamilton at the drawing board, Irishman Creek ca. In , after experimenting with a number of concepts without great success, Hamilton approached Christchurch boat-builder Arnold France to advise on the design.
France suggested a jet unit and loaned Hamilton a US pamphlet on the Hanley Hydro Jet which used a Jet Boat Builders Alberta Web centrifugal water pump system. Throwing water out backwards creates an opposite reaction that drives the boat forward.
Hamilton replicated the system and put it into his first jet boat, a 3. Water was drawn in under the hull and expelled out a leg in the bottom of the boat. Despite his best efforts, however, the boat was only capable of an unspectacular 17kph barely faster than a river current.
In addition to this, because the leg extended below the hull it was prone to damage in the shallow rivers. So Hamilton and his team reworked the original design to expel the jetstream out the transom stern of the boat above the water line, a modification that saw the top speed jump to 27kph. The design eliminated protrusions below the hull exposed to damage. Conjecture posits that the idea came from a high-pressure fire hose in Kiwiana myth Jet Boat Builders Nz Website this has become a high pressure milking hose.
Whatever, it was the genesis of the modern waterjet propulsion system. Hamilton sold his first boat in to a friend. A further breakthrough came in when George Davison, a Canterbury University Engineering graduate working with Hamilton, suggested a 2-stage axial-flow unit. Others had tried using an axial-flow device for propulsion rather than a radial pump or the traditional screw propeller , but Hamilton succeeded in finding a suitable application, where its advantages shallow draught and high manoeuvrability outweighed its disadvantages lower efficiency and higher expense compared to standard propeller power.
Bill on the Ohau River � Easter Shifting to the axial flow jet which generally means high volume and low velocity meant Hamilton could pump a greater amount of water than with the centrifugal pump low volume, high velocity. To increase the velocity of the water, and thus increase boat speed, they incorporated a series of impellers and stator veins which straighten out water flow behind each impeller and added a narrowing of the outlet nozzle.
The result was that the waterjet unit could now pump a high volume of water and expel it at very high speed � meaning it could now be used successfully on bigger and heavier high-speed vessels. After further modifications and the addition of a 3-stage unit, the jet was able to reach speeds of up to 80kph.
Steering was controlled by swivelling the outward flow. Hamilton finally had the craft he dreamed of: a boat able to swiftly manoeuvre past jutting rocks, and forge upstream through malevolent currents.
Powered By. Click here to register for the National Rally National Rally Quarterly JET Magazine. Training from jetboating experts. JBNZ stickers. All racing information.
Owner of the company Adam Wilton and his team have built a wide range of aluminium boats, from recreational jet boats, tour boats, small sea going boats to custom built sports race boats and all kinds of custom trailers. Jettec can help you through any stage of your new boat from bare hull to turnkey, fitting jet units, engines, steering, advise, parts supply, come see the Jettec difference today!
To learn more about Jettec call Adam on or email info jettec. Proud supporter of JetBoating NZ. Enquire Today! These boats are built to order so can be customised to suit. An exceptional lake boat for all the water activities, and still very capable of boating the shallow braided rivers.
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