Home' Work Boat World : July 2010 Contents Advances in MARINE ENGINES and PROPULSION SYSTEMS
July 2010 WORK BOAT WORLD
Waterjet manufacturer HamiltonJet has completed assembly of
the second model in its new HT series -- the HT810. This model
follows on from the success of the HT1000, launched in 2009,
and partially bridges the gap between the popular HM811
model and the larger HT1000.
The HT810 incorporates a number of design improvements
from previous models that provide superior performance, reliability
and serviceability compared to other similar sized waterjet units.
HamiltonJet Technical Manager Phil Rae says the company's
designers learned a lot from the HT1000 project, using this
knowledge to refine the HT810 to make it easier to both
manufacture and service in the field.
"Through the development of the HT series we have been able
to advance several new features of our waterjets, including
one-piece casting of large impellers, compact and efficient reverse
duct designs and improved servicing features," says Mr Rae.
"Many of these design elements are now flowing down to our
other waterjet models."
Not only does the HT810 mixed flow pump offer both
improved efficiency and cavitation performance, with its new
reverse duct design it has a reduced transom footprint for a jet of
its size, enabling reduced jet centers required in narrow hulls or
multi-jet installations. The HT810 is also supplied with a
factory-built transition duct, eliminating the requirement for
this to be fabricated by the boat builder and ensuring accurate
geometry for the intake flow. As with all HamiltonJet waterjets,
thrust forces are transferred to the transition duct and hull
bottom rather than the transom, reducing the requirement for
additional transom strengthening.
The HT810 also continues the long tradition of HamiltonJet
innovation through several new design features. One such feature
is a new arrangement for the positioning and attachment of
sacrificial anodes to prevent corrosion. Utilising a cartridge system
all main internal anodes are able to be inspected and replaced
without having to disassemble the jet unit. This simplifies
maintenance of the waterjet and reduces vessel downtime. Another
new feature is the integrated tailpipe and steering nozzle housing,
eliminating a bolted flange and reducing the overall length of the
jet. The transom flange utilises a compression seal that simplifies
installation alignment and sealing.
The first pair of HT810s will be installed in a 34-metre vessel in
Taiwan, powered by MTU 16V4000 M90 engines and be capable of
over 30 knots.
HamiltonJet is also nearing completion of the HT model range
with the first HT900 waterjets currently being manufactured. These
are scheduled to be assembled in June and shipped to the Gulf of
Mexico for a new crewboat project.
For further information contact:
HamiltonJet, New Zealand.
Final assembly of the new HT810 waterjet at HamiltonJet's factory in
Christchurch New Zealand
HamiltonJet Launches HT810 model
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