Stability Sheet

Ship Data Dialog - Stability Sheet.

Two drop down lists provide you with the ability to select the required Intact and Damaged criteria which are to be used in critical assessments, either as part of loading calculations or the deterministic stability analysis. The criteria available in the lists may be viewed or edited in the Edit Assessment Criteria dialog, accessed via EDIT\ CRITERIA...

The range over which the GZ curve is assessed is defined by the heel range and increment step entered. Please note that the defined range must cover the GZ curve sufficiently to enable each criterion (for the selected criteria) to be assessed correctly. For example, if an area between the equilibrium angle and a roll back angle is to be calculated, the range must cover this extent of the curve, otherwise the full area will not be calculable.

Normally when a downflood point is encountered, the GZ curve is effectively terminated at this point. If, however, the Allow Stepped GZ option is set, then the curve will continue, but any compartments connected to immersed openings will be flooded from the downflood angle, hence producing a step in the GZ curve.

Water on Deck

These two entries are used to determine the height of accumulated water on deck, used in damage stability calculations when water on deck regulations are to be assessed.

The height of accumulated water on deck is determined from the residual freeboard and significant wave height using the formulae given in Deterministic Stability.

Calc has provided you with the ability to alter the upper height limit (default 0.5m), via the Height entry field. This flexibility is in case this value changes in the future, but at the time of going to press, 0.5m should be entered.

The effect of the Significant wave height is also explained in Deterministic Stability.

Both parameters should be entered in meters or feet.