Question

What is Permeability, μ

Permeability is the amount of water that can enter a compartment or tank after it has been bilged. When an empty compartment is bilged, the whole of the buoyancy provided by that compartment is lost.

Question

What is the Effect of bilging on stability

When a compartment in a ship is bilged the mean draft is increased. The change in mean draft causes a change in the positions of the centre of buoyancy and the initial metacentre.

Hence KM is changed and, since KG is constant, the GM will be changed.

Question

Define

Dynamical stability is defined as the work done in inclining a ship.

What is the effect of increasing the beam?

With increased beam

GMt and GZ increase.

Range of stability increases.

Deck edge immerses earlier.

KB remains similar.

What is the effect of increasing the freeboard?

With increased freeboard

GMT and GZ increase.

Range of stability increases.

Deck edge immerses later at greater θ.

KB decreases.