Center of Gravity

DELFTship forum Hydrostatics and stability Center of Gravity

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    • #44552
      Raul
      Participant

      Hello, everybody

      I am quite new to Delftship, and I am not an engineer, I am a nautical archaeologist using this software for research purposes, so my knowledge of this field is not as extent. One of the questions I have about it is if the software is capable of calculating the center of gravity. I noticed there is a value called VCG in the Design Hydrostatics report, but I am not sure if that is whay I am looking for.

       

      Thanks for your help

    • #44558
      Maarten
      Keymaster

      Hi Raul,

      Welcome to the DELFTship forum.

      Centre of gravity (CoG) is a bit of a tricky thing- DELFTship can calculate the CoG of each layer, and the combined CoG’s of all layers (provided you specified a thickenss and a weight to each layer), but DELFTship has no knowledge of construction elements. As these pose a significant portion of the total weight of a vessel an exact CoG can not be calculated based on hull design alone. For this reason the baseic weight distribution of ships is specified in a list of weights that results in the CoG used in stability calculations. This list includes every significant weight that must always be present on a ship- things like engines, masts, rigging, etc.

      We can say more about the centre of buoyancy (CoB), which might help get an idea of where loads might have been to keep a vessel relatively even keeled: the further away from theĀ  CoB the CoG is situated, the bigger the list and trim of the ship will be.

       

    • #44840
      Guillaume Chaussade
      Participant

      Hello Everyone,

      Just starting using Deflt.

      Could you please assit and explain how to set a specific value for Xcg and Zcg ?

      I cannot find the command/tool to do it.

      Thank you

      Guillaume

    • #44842
      Marven
      Keymaster

      Can you please elaborate which Xcg anv Zcg you are referring to? Are you working in hull modeling are with weights for stability?

    • #44843
      Guillaume Chaussade
      Participant

      I am refering to the Hull Xcg & Zcg (I already calculated the values through an extensive weight report)

      As well, i calculated the exact weight value which I need to input.

      My aim is verify the trim value of my hull with specific Xcg & Zcg

      By default, it seems that Xcg is considered above Xcb

      Thanks

       

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