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Hull and Outfitting

Calculating Deterministic Stability

  • Last UpdatedDec 19, 2025
  • 2 minute read

You should enter a unique Title for the deterministic run - this will also change the name of the node in the Calc tree.

The section of the dialog to the right, defines the intact cases to be run. Enter the draft (maximum 40) and trim (maximum 5) values required, (units: meters or feet). The Heel value (units: degrees) and KGf value (units: meters or feet) apply to all intact cases. The Entered drafts are extreme option, can be checked to indicate that the entered draft values are from the underside of keel (that means, include the keel thickness as defined in the Ship Data dialog).

Note:
The KGf table, where up to 8 values can be entered, is only for Grain Heeling Moment Calculations.

A compartment loading subset can be selected from the Deadweight available for loss drop-down list. This list is automatically taken from the various deadweight conditions that you establishes within the Loading Conditions applications area. When this is used in conjunction with the damage type OWL - fall out (in a damage scenario), the benefits of deadweight material 'fall out' can be achieved. Only one compartment loading subset may be selected.

Similarly a container loading set can be selected from the Container Load drop-down list. If specified the container loading set will be included in the stability calculations.

You can select the Criticals, KG's and/or GM's, that are to be considered, and he can specify, if he requires, that the Vertical Draft Scale is to be used. If Envelope Curve Only is selected, then only the envelope of all the critical KG or GM curves will be displayed rather than all the critical curves appearing on the graph.

You can select either to analyze simply Intact or for both Intact and Damaged cases and he can specify if he requires the analyzes to be for all or for only the selected Criticals conditions.

Clicking either the Waves or the Axis Shift buttons within this dialog box results in you being presented with dialog boxes for allowing these options to be turned on and used locally for the specific calculation.

You also have the option to specify the heel direction. By default Automatic will be selected, and the system will decide the direction, but in selected cases you may wish to force Calc to heel to either Port or Starboard.

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