Sea State, Vessel Depth, Freeboard

Discussion in 'Boat Design' started by Leopard, Dec 12, 2022.

  1. Leopard
    Joined: Nov 2021
    Posts: 47
    Likes: 4, Points: 8
    Location: Belgium

    Leopard Junior Member

    Hi,

    How to connect the sea state and vessel depth or freeboard for a particular route? Is there any minimum freeboard for a sea state? Is it okay only to consider the minimum wave height from the range of a particular sea state?
     
  2. Ad Hoc
    Joined: Oct 2008
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    Location: Japan

    Ad Hoc Naval Architect

    The sea state is dictated by the route the vessel will take during its normal day to day voyage.
    That sea state will then dictate, what freeboard will be considered "acceptable". Do you want the vessel to slam and take on green water frequently, or not?
    So that in turn dictates the vessel's depth.

    That's it in a nut shell.
     
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  3. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    Just to add to Ad Hoc comments.

    For most vessels greater than 24m/150 gross tons
    The Load Line and its associated freeboard will be assigned IAW the International Load Line Convention.

    For all vessels it is prudent to do a forefoot slamming and motion analysis for the designed route. This is discussed in depth in Vol 3 of Hydrodynamics of Ship Design Part 4, Chapters 65 and 66
    https://archive.org/details/hydrodynamicsins5765saun/page/n15/mode/2up
     
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