Freeboard Calculation for ship under 24m of length

Discussion in 'Stability' started by santoo, May 11, 2011.

  1. santoo
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    santoo Junior Member

    Hallo all member,

    Can anyone help me for information about rules to calculate freeboard height for ship under 24m length. I have reference to calculate freeboard, INTERNATIONAL CONVENTION ON LOAD LINES - 1966, but that for ship under 24m length.

    I'm so waiting for your answer, this afternoon I have to send it to my boss.

    Thanks,

    ===================
    Santoo
     
  2. santoo
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    santoo Junior Member

    Sorry, I mean,

    I have reference to calculate freeboard, INTERNATIONAL CONVENTION ON LOAD LINES - 1966, but that for ship above 24m length.
     
  3. gonzo
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    gonzo Senior Member

  4. Guillermo
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    Guillermo Ingeniero Naval

    Yes. Under 24 m rules are flag state's ones.
    And they may vary depending on type of vessel and size.
    What kind of vessel and size are you talking about?
     
  5. santoo
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    santoo Junior Member

    @ Gonzo : Hm... Ok, I'll learn it... Thanks Gonzo...

    @ Guilermo : This is for Tug Boat with 23 m Length (96% LWL at 85% Height of ship), can you give me more specific rules for it? Thanks

    Thanks all
    I waiting for your response...
     
  6. Guillermo
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    Guillermo Ingeniero Naval

    You may use the INTERNATIONAL CONVENTION ON LOAD LINES - 1966
    But most probably what will tell what the freeboard needs to be is the complying with the stability criteriae.
    You'll have to check both.
     
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  7. gwboats
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    gwboats Naval Architect

    Under 24m Freeboard

    Santoo,

    Try MGN 280(M) Small Vessels in Commercial Use - Section 12 Freeboard and Freeboard Marking.
    Hope this helps.
     
  8. santoo
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    santoo Junior Member

    Dear All,

    @ Guillermo : Like I posting before, that for INTERNATIONAL CONVENTION ON LOAD LINES - 1966 , I have, just for vessel above 24m length... This is from my reference. Or, maybe you have any ICLL-1966 which comply for vessel under 24m length. I'm very grateful for your help....

    @ gwboat : I'm still trying to find it...
     
  9. gwboats
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    gwboats Naval Architect

  10. santoo
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    santoo Junior Member

    Ok, gwboats....
    Thanks for your help...

    Thanks to all too...
     
  11. Luc Vernet
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    Luc Vernet Senior N.A.

    Excuse me, gwboats, but MGN 280 is for yachts (under 24m. LLL), and although taken as a reference for yachts in many countries, and also containing essentially IMO regulations, it is "only" a publication by the Maritime Coastguard Agency regulation, a UK body, as only applicable for UK registered yachts.
    This do not apply to a tug in Indonesia.

    Santoo: for such boat, only State regulations apply. Consult your State authorities, as said in other posts.
     
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  12. Guillermo
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    Guillermo Ingeniero Naval

    Yes. And I'd bet they will most probably be a mix of the International Convention on Load Lines and the stability requirements, whatever these are in the particular country, as is quite usual for tugs the world around.
     
  13. domn8
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    domn8 New Member

    hi im doing some major work on a 21ft fiberglass hull and i was wondering if i could get some advise on center o gravity n how much wieght is to much to put above the water line ? basicly we have built the original walls of the deck higher an added a cabin all using 12mm ply witch will be eventully sealed.i wont to know if this will though the senter of gavity of and make the boat easely tip .plus the original out inboard has benn removed an in proses of getting an alloy pod built. il get some photos on as soon as i figur out how
    can any 1 advise me plz
    cheers Dom
     
  14. gwboats
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    gwboats Naval Architect

    To Luc Vernet,

    You said:

    Sorry to disagree but MGN 280(M) applies to all vessels under 24 metre in commercial use. The full title of MGN 280(M) is 'Small vessels in commercial use for sport or pleasure, workboats and pilot boats'.
    For yachts the publication relates to vessels that are only used commercially i.e. charter yachts and so not to all yachts.
    Applying this standard to a tug under 24 metres is perfectly acceptable. I understand your point about UK registration but as santoo was not getting any other specific sources I felt this may help him. It was not obvious from his original posting that the vessel was specifically for Indonesia but I agree with other posts that local certification takes precedance.
    It is my experience that as most certifying authorities relate to IMO regulations, so using MGN 280(M) as a design guide without having any other information was a valid point.

    Cheers,
    Graham Westbrook
     
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  15. santoo
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    santoo Junior Member

    Now I waiting for comments from my State authorities, I will inform to you all if I have a result.

    Thanks gwboats, thanks Guillermo and thanks Luc VERNET. You all so helpful for me...

    I confuse enough for this project, because usually I work for vessel above 26m length. This forum so good, because contain of many people from many country and back ground...

    Applause for this forum... for BoatDesign.net/forums...
     
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