b'FOGHORN FOCUSthecomplexityofthecryogenicsystemcan presentchallenges.Incaseswheretherecan be a ready supply, LNG fuel is a viable option, such as for the twin Ro-Pax ferries designed by PVA member BMT for Rederij Doeksen in the Netherlands. This is particularly true for larger vessels, where the greater volumetric requirements of LNG vs diesel isnt as much ofaproblem,andfornewbuilds,where theuniquerequirementsofLNGcanbe betterintegratedintothecoreshipdesign. Otheralternativefuels,suchasmethanol, ammonia,andhydrogen,needfurther development and infrastructure support to be commercially viable.Despite all these developments, diesel remains thepropulsionoptionofchoiceformostDoeksen FerryCredit Rederij Doeksenoperators,despitetheincreasingcostand complexityofcomplyingwithever-more-stringentemissionsregulations.Itisbyfarchoice.Althoughtypicallyoverlookedbygoals,properlydefi netherequirements, the most economical when higher speeds arerequirements that focus on engine emissions,and investigate the trade space. BMT and required,suchasintherecentlydeliveredthehulldesignhasfargreaterimpactonother PVA associate members are standing EnetaiandCommanderferriestoPVApropulsionpowerdemand,consumption,bytohelpbringtogetheraholisticview memberKitsapTransit,andpresentsnoneand emissions than any other technology orofvesseldesign,infrastructure,risk,and oftheadditionaloperational,maintenance,optimization process. economicconsiderations.Alittleeff ort training, or logistics challenges of alternatives. exploring the possibilities will pay dividends AtatimeofincreasedindustryfocusonEvery operation and route are unique. Withby driving towards a solution that best fi ts an efficient and alternative propulsion, it is worthmultipleoptionsnowavailable,operatorsoperations particular circumstances. remembering that the right naval architectureconsidering a vessel program should consult basisthe hull formremains a fundamentala skilled ship design consultant to establish About the Author: JIM MORGANBMTJim Moran is naval architect and ship design manager with more than 30 years of experience. As BMTs Principal Naval Architect based in the U.S., he has led commercial and government ship design projects, including the Potomac Riverboat Co. water taxis and the New Orleans RTA ferries. FOGHORN FOCUS: MARINE PROPULSION 22 FOGHORN'