Rhino hydrostaticts

Discussion in 'Software' started by MYD, Jan 1, 2009.

  1. MYD
    Joined: Dec 2008
    Posts: 8
    Likes: 1, Points: 3, Legacy Rep: 14
    Location: Sweden

    MYD Junior Member

    I am wrestling with the hydostatics in Rhino.
    I have "built" a design I did 10 years ago and have built and sailed a lot so I know the data well. Having "built" it in Rhino all displacement figures fits very well but when I try to run the hydrostatics with input from the weight calculator the boat end up floating bow down more than 45 dgr.

    Anybody out there with experience from this tool. I think I have followed the instructions in the hydrostatics help but obviously I am doing something wrong.
     
  2. Tad
    Joined: Mar 2002
    Posts: 2,308
    Likes: 192, Points: 73, Legacy Rep: 2281
    Location: Flattop Islands

    Tad Boat Designer

    Hummm....

    Perhaps check where you are from zero....the boat may be positioned on the negative side rather than the positive?
     
  3. MYD
    Joined: Dec 2008
    Posts: 8
    Likes: 1, Points: 3, Legacy Rep: 14
    Location: Sweden

    MYD Junior Member

    Thanks, I had the boat on the negative side with the zero at the forward end of the waterline.

    I moved it so the aft part of the transom is now at zero and the boat is on the positive side and now it all comes out right but when I ask to have the boat in the correct floatation position it moves aft till it has the zero point about midways??????????????
     

  4. MikeJohns
    Joined: Aug 2004
    Posts: 3,192
    Likes: 208, Points: 63, Legacy Rep: 2054
    Location: Australia

    MikeJohns Senior Member

    So you are using rhino-marine.

    If it ends up trimming down by 45 degrees your weights and moments are out. Check that your upright CG matches your CB for a start.
     
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