X-Bow Resistance calculation

Discussion in 'Boat Design' started by arunb047, Aug 6, 2012.

  1. arunb047
    Joined: Feb 2012
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    arunb047 Student Naval Arch

    How does the resistance calculation of ulstein x-bow ships vary from other ships?
    Can the reduction in resistance achieved by this type of ships be shown theoretically??

    Any details regarding x-bow ships are welcomed..
     
  2. yipster
    Joined: Oct 2002
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    yipster designer

    Wasnt the x-bow for rough wheater?
    Guess your looking for dynamic resistance than..
    Program like seakeeper or maat hydro may help
    free trial maat hydro in the sftware section under
    Marine Design Software for Hull Modeling? (2012)
     
  3. arunb047
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    arunb047 Student Naval Arch

    Thank you for the information. But can you please explain a bit about Dynamic resistance??
     
  4. yipster
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    yipster designer

    reply I made was from what I recalled of the x bow
    on mobil now again I am not that handy opening multi pages
    meanwhile did check that x bow and its for the rough alrite
    saw some more extraordinary claims and that the first ship was build
    that should give some real figgers and ofcourse a reversed bow
    gives a longer more desrirable waterline for better eficiency
    witch can be calculated with most ship design software
    by dynamic I meant a ships behavior in a seaway as the x bow
    was designed for and programs named smulate those conditions
    did also see some real nice x bow animations hard to distinguise from real
    will check on pc later if the term dynamic resistance exist or what its called
    and how calcalated as high waves and seaway do influence basic resistance
     
  5. yipster
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    yipster designer

    hello again arunb047, find it lot more natural to cut and paste links than on a phone :)
    "dynamic resistance" although more often mentiont is my wrong as Andrew Mason mentiont here
    after checking Ulstein's site and part of the Marin report i remain skeptical on those x-bow hulls
    testing the x-bow in above mentioned programs be more interesting than this calculation
    on the difference a reversed bow in undisturbed water makes

    when you have the time do read the seakeeper manual
     
  6. Ad Hoc
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    Ad Hoc Naval Architect


    The "resistance calculation" doesn't change, only the result. The procedure/methodology for an X-bow or any other type of bow, to calculate the resistance, remains the same.
     

  7. arunb047
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    arunb047 Student Naval Arch

    Thank you sir
     
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