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Moment_of_Inertia = 1/12 * INTEGR(Hull(@X, @B3_Frame, Lpp, B), 2, @X, @B3_Frame, 2, 0, Lpp)

Third power of the width at a specified frame number in m^3: 

B3_Frame = B_Frame^3

Do not forget to provide all dimensions and references, and change the Determined by fields to SYS: System/equation

Note that the syntax of the moment of inertia relation is similar to that of the waterplane area relation.

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• Run a solution for the initial stability GM of every possible ship, by selecting the

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• Ships object and GM as task in the

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• Process Manager.

If the object Hull in the solution is now opened again, you'll see that the columns X and B3_frame are added to the object, whose values are calculated for every case of Frame and Rel_B within Hull. Note that the parameter B_Frame is also added, as it is used to calculate B3_Frame. See figure 4. Again, only the values of the last ship (last input case) are stored in the object.

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