Regulation 5-1 – Stability Information to be Supplied to the Master

 Any limiting GM (or KG) requirements arising from provisions in regulation 6.1 (regarding partial attained subdivision indices), regulation 8 or regulation 9, which are in addition to those described in regulation 5-1.4, should also be taken into account when developing this information.

  1 Linear interpolation of the limiting values between the draughts d_s , d_p and dl is only applicable to minimum GM values. If it is intended to develop curves of maximum permissible KG, a sufficient number of KM_T values for intermediate draughts should be calculated to ensure that the resulting maximum KG curves correspond with a linear variation of GM. When light service draught is not with the same trim as other draughts, KM_T for draughts between partial and light service draught should be calculated for trims interpolated between trim at partial draught and trim at light service draught.

  2 In cases where the operational trim range is intended to exceed ±0.5% of L_s , the original GM limit line should be designed in the usual manner with the deepest subdivision draught and partial subdivision draught calculated at level trim and actual service trim used for the light service draught. Then additional sets of GM limit lines should be constructed on the basis of the operational range of trims which is covered by loading conditions of partial subdivision draught and deepest subdivision draught ensuring that intervals of 1% L_s are not exceeded. For the light service draught dl only one trim should be considered. The sets of GM limit lines are combined to give one envelope limiting GM curve. The effective trim range of the curve should be clearly stated.