Wave resistance

Discussion in 'Multihulls' started by weys, Jan 15, 2007.

  1. alpamis34
    Joined: Jul 2006
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    Location: A city that never sleeps-Istanbul

    alpamis34 Senior Member

    Calculating the resistance of catamarans differs from the monohulls due to some extra drag.The major effect is the wave interference effects between the hulls.It varies subject to the type of the hulls which can either be symmetric asymmetric or etc.The best way for you to get the result is to run CFD,there will be some spikes of course but presumably gonna give the best.Cheers
     
  2. Leo Lazauskas
    Joined: Jan 2002
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    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

    There is no need to "run CFD" if you are just after the optimum spacing of the hulls. There are some reasonably simple formulas that you can use. See for example:
    Optimum spacing of a family of multihulls, E.O. Tuck and L. Lazauskas, Schiffstechnik, Vol. 45, No. 4, Oct 1998, pp. 180-195.
    www.cyberiad\library\pdf\tl98.pdf
     
  3. weys
    Joined: Dec 2006
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    Location: haarlem

    weys Naval architect student

    I have calculated it to michlet but now i am checking all the inputs in winedt , It seems to be working will post some results tomorrow and you can give your opinion about it .

    Hey has anybody got nr naca profiles for dagger keel , and i am looking lift/drag coefficenten for main sail, jib and spinnaker in different apparent winds ,

    You are free to send me info
    weys@hotmail.com
    subjest cat
     
  4. terhohalme
    Joined: Jun 2003
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    terhohalme BEng Boat Technology


  5. Leo Lazauskas
    Joined: Jan 2002
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    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

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