SUMMARY AND CONCLUSION ■■ Due to the focus on environmental issues and the increasing fuel prices,ship owners are more and more interested in solutions to save fuel.Wartsila can offer several different options for fuel savings. With modem design propellers,grinding and repair and modification of heavy running propellers considerable hydrodynamic improvement can be established,with attractive Return On Investments. By the application of ducted propellers however,and especially the Lips high efficiency nozzle,an increase of free running propeller efficiency of 15%can be reached,with a payback period of 1 to 1.5 years WARTSILA is a registered trademark.Copyright@2006 Wartsila Corporation. Wartsila Propulsion Netherlands B.V. Lipsstraat 52,P.O.Box 6,5150 BB Drunen,The Netherlands ●Tel.+31416388115●Fax+31416373162●www.wartsila.com WARTSILA WARTSILA COMWÄRTSILÄ® is a registered trademark. Copyright © 2006 Wärtsilä Corporation. Wärtsilä Propulsion Netherlands B.V. Lipsstraat 52, P.O. Box 6, 5150 BB Drunen, The Netherlands ! Tel. +31 416 388115 ! Fax +31 416 373162 ! www.wartsila.com WARTSILA.COM SUMMARY AND CONCLUSION Due to the focus on environmental issues and the increasing fuel prices, ship owners are more and more interested in solutions to save fuel. Wärtsilä can offer several different options for fuel savings. With modern design propellers, grinding and repair and modifi cation of heavy running propellers considerable hydrodynamic improvement can be established, with attractive Return On Investments. By the application of ducted propellers however, and especially the Lips high effi ciency nozzle, an increase of free running propeller effi ciency of 15% can be reached, with a payback period of 1 to 1.5 years