Metacentric Height (GM)

DELFTship forum Hydrostatics and stability Metacentric Height (GM)

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    • #37032
      jose
      Participant

      Dear Sir,

      Where can I find the Metacentric Height (GM) of my model?

      The software only gives you the distance from the keel to the metacentre (KM) value.

      Thank you

    • #37037
      Marven
      Keymaster

      Simply subtract VCG to obtain your GM, where VCG is the height of the center of gravity above the base line.

      GM = KM – VCG

    • #37047
      jose
      Participant

      Oh, OK, thanks!

      I didn’t see VCG value in the Hydrostatics report the other day.
      Found it now. 🙂

    • #37051
      Marven
      Keymaster

      vcg is not a hydrostatics property, it is the vertical center of the weigt of the vessel. this should be calculated or estimated by you

    • #37413
      Denis Pratt
      Participant

      Not only is VCG very important and must be closely estimated by the designer, but the weight and LCG is also very important.
      For planing hulls the weight and LCG leads to initial trim and a bad initial trim is one thing no one wants.
      Usually after a boat is built and fitted out the only simple way to correct a case of bad trim is to add weight.
      A “no-no” for planning boats performance and carrying around extra weight for any boat is only adding to fuel consumption or speed loss.

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