船舶概论-渔船(英语版)

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1、BriefdiscussionofseveraltypesofshipsThediscussionofthevesselsbelowineludesgeneraldescriptiondimensionsandothercharacteristics.forexample‘importantfeaturesforacontainersvesselarethemaximumnumberofstandard-containersitcancarryanddeadweight.Forapassengership.thedeadweightisnotimportantbutthe

2、numberofpassengersis・Atughastodeliverahighbollardpull・whereasthatisnotimportantforadredger.2.5FishingvesselsTrawlersTrawlersarefishingvesselswhichdragtheirbag-shapednetsthroughthewaterpelagicfishery.Thenetsaresuspendedbetweenthewatersurfaceandseabed」nbottomfishery,thenetisdraggedoverthebe

3、aded・whichrequiresahighpullingpower.especiallyifthenetsareequippedwithdisturbingchainstochumuptheseafloor.Theconstructionandequipmentofthesefishingvesselsstronglydependonthefishingmethodandthespeciesoffishaimedat.Thefishiskeptonboardduringthefishingtripasrefrigeratedcargo・Themostimportant

4、typesoftrawlersarethederrick-cutterandthesterntrawler.Thederrick-cutterpullstwonets・Oneoneitherside・fromtheendsoftwoderricks.whicharefittedlow.atthedoubleforemast・Eachnetiskeptopenbyatransversebeam・providedwithslidingshoesandwaking・upchains・Thederricksareloweredasclosetothewateraspossible

5、duringfishing.topreventstabilityproblemswhenoneofthenetssuddenlyfillsupwithfish.orstandorgetshookedatawreckorsuchlike.Thestemtrawlerhasonlyonenet」aunchedfromaslipwayatthestem・Thisnetiskeptopenbytwoboardsshearingaway.onetoeithersidebytheshipsspeed・Stern-trawlersareusuallylargerthanderrickt

6、rawlers・Trawlersareliketug-boats.Theyhavetopullthenetswitharelativelylowspeedovertheseabed・whichrequiresenormouspowerespeciallyattheofapull・Whenthenetisfullinthoseshipsdieselenginesareinstalledwithapowerasinatugboat.Theonlydifferenceisthatthetugboatcanbeshorterinlengthwiththesamepower,asi

7、tdoesnotneedspaceforcargo,ThepropellerisbuiltinaKort-nozzleboostingthepropeller-performancebysome25to30percentandthebollard-pullaccordingly.PropellersareinstalledaslargeaspossibleinaKort-nozzlewithadiametersolargethatitprotrudesdeep(onemetre!)belowthebaselinetoachie