Keel modification / CFD analysis

Discussion in 'Boat Design' started by jelfiser, Jun 1, 2008.

  1. jelfiser
    Joined: May 2006
    Posts: 111
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    Location: Italy

    jelfiser Senior Member

    hi to all,
    that's ok that lead keel dosesn't look so good,
    Now we want a bigger RM , for IMS rating and stability,
    where we are it' s quite expensive building a new one.
    we have the possibility of making some modification/optimization to the existing one, also using CFD at university.

    Today i mesured and made the 3d model we are going to test
    I woluld like to post in coming week the development about this
    Has someone some similar experiences or may suggest the best way to proceed?
     

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  2. TeddyDiver
    Joined: Dec 2007
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    Location: Finland/Norway

    TeddyDiver Gollywobbler

    Casting lead isn't impossible task to do.. Anyway I would.. if I had enough of it..
     
  3. jelfiser
    Joined: May 2006
    Posts: 111
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    Location: Italy

    jelfiser Senior Member

    Thanks you, teddy
    we are just evaluating some alternatives at the same weight
    here he models . in teh middle th exsisting one
    on the left a possible modification and on the right an ipothesis for a new one ...
    any opinion ? thanks
     

    Attached Files:

  4. ivor Bittle
    Joined: Feb 2008
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    Location: England

    ivor Bittle Junior Member

    Keel modification.

    This is an interesting shape. Would you care to explain the thinking that leads to it?

    Ivor Bittle
     
  5. jelfiser
    Joined: May 2006
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    Location: Italy

    jelfiser Senior Member

    Hi ivor thank you ;
    the existing one was modified with 170 kg in the bulb to give somewath more stability ... however the boat stll has an hig cg and we are evaluating some alternatives for better stability with less drag .... any suggestion?
     

  6. ivor Bittle
    Joined: Feb 2008
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    Location: England

    ivor Bittle Junior Member

    Keel modification.

    I could not believe my eyes when I saw this keel. Try my web site www.ivorbittle.co.uk section 1 section 6 on the keel and bulb to see where I think you should be.

    You will see why I am not surprised to hear of your stability problems. There is no reason to use cfd when we have ironclad data to work with and getting the shape right is more important than anything else.

    Come back on this if you think that I can help.

    Ivor Bittle
     
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