Feature 7 | WATERJETS
27,000kW. In sharp contrast, the new system series offers jet sizes ranging from 510mm to 3250mm, and shaft power up to 4500kW. The group is keen to stick to stainless
Ultra Dynamics’ UJ575 features a maximum power input of 1268kW.
steel during the manufacturing process. According to Wärtsilä: “Although aluminium is a widely used and accepted material for jet fabrication, the Wärtsilä solution utilises abrasion- resistant stainless steel to conserve the carefully designed shape of the stator blades, in order to retain high levels of fuel efficiency. The impeller and shaft are also constructed from stainless steel and these features deliver high performance and reduce short-term maintenance requirements.” The waterjets in the midsize series
Wärtsilä’s new midsize waterjet series offers sizes ranging from 510-3250mm and shaft power up to 4500kW.
also reveals that the group is planning to introduce some new model sizes soon. The group currently uses 3D modelling for all of its UltraJet designs, incorporating elements such as stress and flow analysis.
Midsize market Meanwhile, Finnish propulsion system provider Wärtsilä recently introduced a brand new series of waterjet solutions, in
response to particular demand from the high speed ferry, high speed patrol craſt and yacht and leisure boat segments. The new midsize series expands on
the group’s previous stainless steel jet offerings, introduced to the market in 2006 with the launch of Wärtsilä’s axial flow jets, which were primarily aimed at providing propulsion for vessels sized 100m and over, and which boasted power ratings of up to
are presented in a ‘plug and play’ style, for what Wärtsilä describes as instant and easy installation. The packaged jets feature inlet duct shapes, which have been optimised, in advance, to suit different hull forms. Subsequently, the group intends to save shipyards the bother of having to oversee inlet duct construction work themselves. The integral inlet duct designs were researched by Wärtsilä’s Computational Fluid Dynamics (CFD) department, in order to offer the best hydrodynamic properties possible. Additional ly, the new family
of jets has been formulated with environmental considerations in mind. The midsize solution’s hydraulic system has been designed so that no oil-retaining elements protrude outside of the craft’s transom. SBI
MARINE DIESEL ENGINES · SOLAS Approved BUKH · SeasAll · Alamarin-Jet · Steyr · Callesen Service
BUKH A/S · Aabenraavej 13-17 · 6340 Krusaa · Denmark · Tel +45 74 62 20 88 ·
bukh@bukh.dk ·
www.bukh.dk 60 Ship & Boat International July/August 2011
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