Stability

When a ship with negative initial metacentric height is inclined to a small angle, the righting lever is negative, resulting in a capsizing moment. This effect is shown in Figure 24.1(a) and it can be seen that the ship will ... [Download and Read document]

To investigate the effect of beam and freeboard on stability, it will be necessary to assume the stability curve for a particular vessel in a particular condition of loading. Let Curve A in Figure 23.1 represent the curve of stability ... [Download and Read document]

Dynamical stability is defined as the work done in inclining a ship. Consider the ship shown in Figure 22.1. When the ship is upright the force `W' acts upwards through B and downwards through G. These forces act throughout the ... [Download and Read document]

Bilging amidships compartments When a vessel floats in still water it displaces its own weight of water. Figure 21.1(a) shows a box-shaped vessel  floating at the waterline WL. The weight of the vessel (W) is considered to act downwards through ... [Download and Read document]

When a problem involves a change of both list and trim, the two parts must be treated quite separately. It is usually more convenient to tackle the trim part of the problem ®rst and then the list, but no hard ... [Download and Read document]

The water pressure at any depth is due to the weight of water above the point in question and increases uniformly with depth below the surface. From this it can be seen that the pressure at any depth will vary ... [Download and Read document]

1. Box-shaped vessels The draft of a vessel is the depth of the lowest point below the waterline. When a box-shaped vessel is ¯oating upright on an even keel as in Figure 17.1(a) the draft is the same to port ... [Download and Read document]

1. Cross Curves of Stability (a) GZ Cross Curves of Stability These are a set of curves from which the righting lever about an assumed centre of gravity for any angle of heel at any particular displacement may be found ... [Download and Read document]