Home' Baird Maritime : July 2011 Contents ADVANCES IN MARINE ENGINES AND PROPULSION SYSTEMS
HamiltonJet has been selected as the
propulsion partner in three recent
innovative catamarans, all working in
the offshore industry.
In each case the combination of
wide operating envelope, enhanced
manoeuvrability and proven durable design
were contributing factors to the selection of
the propulsion and control package.
The first of these vessels to be built was
'Windcat 21', constructed by AF Theriault
and Son for the UK/Netherlands-based
Windcat Workboats. Windcat has been
supplying vessels for the offshore
windfarm support market since the early
2000s and this recent expansion of their
fleet is their third generation of vessels.
Windcat utilised HamiltonJet in their
first generation of vessels and, having
trialled other forms of propulsion, again
selected HamiltonJet for their most recent
builds. Usable low speed thrust was a
critical selection factor for these 18-metre
vessels to ensure the vessels' "step over
system" can safely allow crews to transfer
to the tower in all conditions and the twin
HamiltonJet HM571 waterjets helped the
vessel record over eight tonnes of bollard
pull during trials. Sister ships are already
The second vessel, which was recently
completed at Kockums of Sweden for
Fintry Marine, is the 'CarboCat 23'. This
23-metre catamaran is the first offshore
windfarm support vessel to utilise carbon
fibre construction. Twin HamiltonJet
HM571 waterjets propel the vessel to 31
knots top speed although service speed will
be around 25 knots.
Manoeuvrability is one of the key factors
during the crucial docking procedures for
these types of vessels and the compact and
integrated HamiltonJet hydraulics solution
provides the most rapid controls response
available, making for enhanced vessel
manoeuvrability even when compared to
other waterjet vessels.
The third vessel is a 28-metre catamaran
currently in build in the UAE at Topaz
Shipbuilding. The vessel, designed by Incat
Crowther, will be the first in the offshore
industry to utilise a wavepiercing hull
form. The vessel will use twin HamiltonJet
HM651 waterjets to reach speeds in excess
of 30 knots and also has over 50 square
metres of deck space for carrying cargo.
High performance and also high
durability in the harsh operating
environment were key considerations for
the propulsion system for this vessel and
the HamiltonJet inboard hydraulics,
stainless steel stator leading edges and
unrivalled applications experience proved
to be critical features for the propulsion
selection in this case.
For further information contact:
HamiltonJet, New Zealand.
Voith Turbo unveils offshore wind farm shuttle vessel design
Voith Turbo Marine Engineering has developed the "Voith
Offshore Shuttle" for wind farms. Its special feature, the so-called
MOTS-system (Momac Offshore Transport System) is installed at
the bow. The new system consists of a swivel arm robot, which
allows for the safe transfers of people and goods from vessel to
vessel or from vessel to offshore wind energy plant.
For the new Voith Offshore Shuttle, Voith Turbo Marine
Engineering entered into a cooperation with the machine builder
Momac. Momac manufactures special-purpose machinery,
automated devices and robots. Among other products, the
company specialises in robot-assisted transfer systems and has
developed the MOTS swivel arm robot. The MOTS swivel arm sets
new performance standards for the safe transfer of people and
goods by actively compensating ship movements.
The system consists of a robot installed at the bow, fitted with
a transport basket with a maximum capacity of 250kg. The freely
adjustable robot arm allows safe transfers of personnel onto
wind farms and also onto larger vessels,-even if the seas are
rough. The system can compensate vertical differential
movements of up to 3.2 metres.
Voith combined the compactly designed MOTS-system in this
ship concept with the new Voith Inline Thruster in the bow. In the
stern of the ship are two Voith Schneider Propellers (VSP
18R5EC/150-1). The body of the Voith Schneider Propeller, which
is fitted with several axially parrallel blades, rotates around its own
vertical axle. Since this creates the same thrust in all directions, the
Voith Schneider Propeller allows highly accurate manoeuvring, as
well as active roll stabilisation to reduce the rolling motions of the
vessel - and this even at stillstand (zero speed).
In combination with the Voith Inline Thruster, this feature
enables dynamic positioning of the ship. The Voith Inline Thruster
is a propeller drive, where a permanently excited electric motor
acts as the housing. Thanks to its seawater-lubricated bearings, the
drive is completely maintenance-free.
On average, offshore wind energy plants have to be accessed two
to three times a year for maintenance work. In the North Sea,
personnel transfers are only possible on an average 230 days per year.
With MOTS and the Voith Offshore Shuttle, Voith believes the time
slot can be extended by up to 35 percent to approximately 310 days.
Apart from the six-man crew, the ship can hold up to 12 service
technicians. Due to existing tank capacities, the ship is capable of
operating in the offshore wind park for up to 14 days. A large deck
surface offers room for four ten-foot containers, and an on-board
crane in the stern area is available for loading and unloading tasks.
For further information contact:
Voith Turbo, Germany. Web: www.voithturbo.com
'Windcat 21' [Photo: Windcat]
'CarboCat 23' [Photo: Fintry]
HamiltonJet selected for a range of innovative catamarans
July 2011 BAIRD MARITIME
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