How to dimension a sailing catamaran?

Discussion in 'Multihulls' started by terhohalme, Apr 27, 2008.

  1. yiesyisyeno
    Joined: Sep 2009
    Posts: 3
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    Location: greece

    yiesyisyeno New Member

    litl program to run ol the formulas in masters doc

    ..xkuz MI egen but i opened the .xlm with a viewer and i noticed it dosnt hav formulas in to auto calc the results...mab its koz of the viewer...M NOT SUR!!!

    SO IF ANIONE INTRESTED IN MI LITL PROGRAM PLZ LET MI KNOW...I L B HAPI TO MAIL IT ... KENT POST KOZ MANIE B SOULD NT TOUCH IT....KSSSSST MANIE B
     
  2. dod
    Joined: Sep 2009
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    Location: slovakia

    dod New Member

    steel hull

    hi terho,
    does it work for steel hull?
    dod
     
  3. terhohalme
    Joined: Jun 2003
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    Location: Kotka, Finland

    terhohalme BEng Boat Technology

    Sure, it's a geometric study really, not depend on materials. You just can't have steel hulls light enough to have decent load capacity. Lenght displacement ratio barely can be more than 5 for steel (should be 6 or more).
     
  4. Speng
    Joined: Jun 2007
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    Location: USA

    Speng Junior Member

    Major thanks for these documents as they'll come in handy for a design I'm doing. Good to see that the numbers I'd come up with from my research weren't too far off. A few questions and comments:

    1) How can I be sure I have the latest posted version of the files is it just a matter of searching the thread backward to the last posted?

    2) I'll be very happy to have the document (PDF) with the references.

    3) Personally I think the standards should be free especially if you're an EU citizen after all you pay taxes don't you. In the US the government makes charts (paper and electronic) and they're free while here in England you have to pay for them.
     
  5. terhohalme
    Joined: Jun 2003
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    Location: Kotka, Finland

    terhohalme BEng Boat Technology

    1) The latest published spreadsheets are always here:

    http://www.boatdesign.net/forums/downloads.php?do=cat&id=1

    2) I'd be very happy to have the time to add the references. Most of the formulas are common NA, basic math and physics anyway. Some are from ISO standards and some (only few and nothing too scientific) are my own findings during my design and study work. It is just a note paper...
     
  6. fiqhy
    Joined: Sep 2012
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    Location: Indonesia

    fiqhy New Member

    If its mde of Steel, what about the material cost and empty boat mass?
     
  7. isladelobos
    Joined: Jun 2014
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    Location: Atlantic ocean

    isladelobos Junior Member

    Hi.

    Terho, his is a good interesting document.

    Thanks.
     
  8. isladelobos
    Joined: Jun 2014
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    Location: Atlantic ocean

    isladelobos Junior Member

    What is the method to draw in 2D this ellipse or shape?
    What is the general method to hand draw the hull, respecting the area dimmensions?
     

  9. Andre Holanda
    Joined: Aug 2021
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    Location: Recife, Pernambuco - Brasil

    Andre Holanda New Member

    Good afternoon, I'm new to the channel, and even younger in the naval world. I have been researching projects for a catamaran (free, to no avail) that can be built in wood and fiberglass. The prices of a project like this, for my reality, are high, so I started to try to understand and try to design one. And that's where it falls here on the forum. I would like to know, if I could inform the data I have in mind (I don't know if it works) and the design of the vessel's interior, to hear the opinions? I've already started playing with the spreadsheet :)


    I forgot the main thing, which was to thank TerhoHalme for the initiative and for the so complete worksheet provided !!!
     
    Last edited: Aug 18, 2021
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