4.9 Form stability particulars
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.456 – Guidelines for the Preparation of Intact Stability Information – (Adopted on 13 October 1986) - Annex - Guidelines for the Preparation of Intact Stability Information - 4 Category 1A - 4.9 Form stability particulars

4.9 Form stability particulars

 Form stability data at the designed trim showing the relationship between righting lever, angle of heel and displacement drawn in curves or tabulated.

 The data should cover the full range of displacement extending from light to maximum draughts with a range of inclination appropriate to the type of ship and stability criteria adopted.

 If the data is given in the form of curves, the scale and accuracy should be to the satisfaction of the Administration or government recognized organization. Intervals of displacement and righting lever when tabulated and angles of inclination should be sufficient to meet the accuracy demanded by the stability criteria. Below 50° the intervals of inclination should not exceed 10°, however, closer spacing may be required according to the ship form and proportions, also to the stability criteria adopted.

 A statement should be appended to the data, indicating the erections and/or timber deck loads which are included.

 Where the operating trim or the form and arrangement of the ship are such that change in trim has an appreciable effect on righting arms, additional form stability data should be included for a suitable range of trim.

Parent topic: 4 Category 1A
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