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October 2011 www.sname.org/sname/mt Fitted with a ?ight deck and hangar for the navys Seasprite SH2G helicopter, Wellington can conduct helicopter operations in conditions up to sea state 5. Design and all of them powered by Wärtsilä dual-fuel engines. e latest newbuilds are VS489 class ships and are state-of-the-art in terms of eciency and ex- ibility. eir features include an improved and more ecient hull form, exible machinery with a combi- nation of two Wärtsilä 20DF and two Wärtsilä 34DF engines, redundancy, and reliable performance using the Wärtsilä low loss concept electrical propulsion system. e onboard accommodation is also mod- ern, comfortable, and improved from earlier designs. All in all, the benets of LNG as a fuel outweigh the disadvantages. e fuel exibility option enables the right fuel to be used when sailing in emission control areas, or the most economical fuel where emission regulations allow. Dual-fuel engines also preserve the residual value of the ship should it be sold for use in an area where LNG is not available. e elec- tronic control ensures excellent fuel economy while the environmental benets through emission reduc- tions are huge. Wärtsiläs group of dual-fuel engines ranges from 800 kW to 17,000 kW and includes three engine types, the 20DF, 34DF, and the 50DF. Viking Energy was an important stepping stone in the march towards meaningful environmental sus- tainability for marine transportation, with the use of LNG for fueling ships playing a key role. MTAt an overall length of some 94 m, Viking Energ y is one of six LNG-fueled PSVs currently in operation.