be operated via either joystick control or autopilot. A built-in redundancy underwrites robustness and safety.
A significant business boost for Australia- based Doen Waterjets is anticipated from a recent agreement between Doen Pacific and Thrustmaster of Texas enabling the US thruster specialist to expand its production programme with waterjets. Thrustmaster will exploit part of a manufacturing facility in Houston, which benefited from an investment of US$ 40 million in 2009, to produce Doen jets for sale in North/ South America and Europe.
Field support will come from a Thrustmaster
global sales and service network that includes Houston, Houma, Rotterdam, Singapore, Dubai, Brazil and India.
Evolved over almost 50 years, Doen
Waterjets’ portfolio has hitherto embraced 13 models covering an input power range from 100kW to 4,000kW for leisure, commercial and military vessel propulsion. Speeds of up to 45 knots are reportedly combined with ‘exceptional’ low speed thrust and load- carrying capability. Three axial flow design programmes – the DJ100, 200 and 300 series – have been offered, with different options and installation methods to suit diverse hull forms and structures. Targeting larger commercial applications,
however, Thrustmaster plans to introduce two new models – the 400 and 450 series – extending the power input range to 6,400kW. The Thrustmaster Doen line-up will then cover: • 100 Series waterjets available in seven model sizes with input ratings from 100kW to 900kW for vessels from 6m to 20m in
length, supported by simple mechanical and electronic control system options; • 200 Series waterjets available in four stainless steel model sizes from 400kW to 2,500kW for vessels from 15m to 45m in length, supported by a full range of electronic controls with joystick docking; • 300 Series waterjets available in two stainless steel model sizes from 1,300kW to 4,000kW for vessels from 30m to 60m in length, supported by a full range of electronic controls with joystick docking; • 400 Series waterjets available in two model sizes from 100kW to 6,400kW for large vessels, supported by a range of electronic controls with joystick docking.
Finnish contender Alamarin-Jet’s new 245 waterjet design features a reportedly unique Combi-Frame construction that allows installation either outside or inside the hull. Vessel designers are thus able to optimise weight distribution and engine location; an over-sized inspection hatch can also be arranged outside or inside the vessel to ease maintenance. In addition, the Combi- Frame is said to simplify installation when repowering from another waterjet type or from a sterndrive system. Long and short tail applications are facilitated.
Other design features highlighted by Alamarin-Jet – all simplifying installation and operation – are an integrated hydraulic steering cylinder compatible with common helm pumps, an integrated hydraulic cylinder for reverse deflector control, an integrated hydraulic oil cooler and a replaceable conical stainless steel impeller wear ring. A special
Castoldi expands its Turbodrive range
Italian specialist Castoldi is developing what will be the largest model in its Turbodrive programme, which currently includes the 238, 240HC, 282, 340HC, 400HC and 490HC models. impeller
(The nomenclature inlet diameter indicates in millimetres the and
HC denotes the incorporation of a hydraulic clutch). The continuous duty power ratings for fast vessel propulsion covered by the series range from 184kW to 1,103kW, while intermittent duty ratings extend from 250kW to 1,324kW. The new 600HC model will be based on the
company’s established technology but exploiting what the company’s founder, Giacomo Castoldi, described as “a new and revolutionary design” that cannot yet be unveiled. Some details can be reported, however:
the pump will be a three-bladed, single-stage axial flow type and the impeller diameter will be 600mm at the inlet. An integrated gearbox
www.mpropulsion.com
will be offered with a choice of 25 reduction gear ratios. A dry unit weight of 1,580kg will include the gearbox, hydraulic clutch, anodes, levers, water intake, grid and duct. Maximum power inputs will be 1,985kW (intermittent duty) and 1,655kW (continuous duty); single-, twin-, triple- and quadruple- jet installations will respectively serve fast vessels with maximum displacements of 28-34 tonnes, 70-84 tonnes, 120-143 tonnes and 207 tonnes.
An integrated electrically-operated multi- disc hydraulic clutch will enable disconnecting and connecting of the waterjet impeller while the engine is idling. A special light and compact hydraulically-actuated Castoldi Twin Duct reversing bucket system will deliver 75 per cent of the forward static thrust. Steering will be hydraulically actuated via a special nozzle integrated in a protective bowl. Optimisation of the full range continues
to be pursued and Mr Castoldi cited a new tail design, now installed on all models, for reducing turbulence and improving steering efficiency, along with new control panels of a more functional design and integration of the position-keeping function in the company’s ACES electronic control system. Among current commitments, Castoldi is supplying eighty Turbodrive 400HC waterjets for an Indian Navy fast intervention craft programme, the 15m-long vessels having a speed of 47 knots. The contract is the largest secured by the company in recent years. Castoldi also stresses its role as a boatbuilder, manufacturing
a 17-model
range of Jet Tenders from 4.2m to 10m in length and including two Solas rescue boats. The business provides a valuable opportunity to test waterjets and provide feedback on their performance and reliability in service.
Marine Propulsion I April/May 2014 I 73
Quadruple Wärtsilä jet sets serve US Navy Freedom-class trimaran Littoral Combat Ships
stator and steering nozzle design contribute to an ‘exceptionally good’ steering response. With an axial flow single-stage pump, the aluminium/stainless steel jet is suitable for drives from engines with outputs up to 235kW and maximum speeds of 4,600 rpm for the impeller shaft; the impeller has a maximum diameter of 245mm. A forward bollard pull up to 8kN can be generated, fostering high cavitation limits, while the reverse pulling force is considered high at some 60 per cent of the forward thrust. MP
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