where k is the radius of gyration. This can be increased by stowing weights well away from the
ship’s centre of gravity, g is acceleration due to gravity, GM in metres.
k can be estimated as being 0.35 ð Breadth Moulded.
It can be seen that if the radius of gyration remains constant, the period can be altered by
increasing or decreasing the GM. As the ship’s period will normally be greater than the wave
period, an increase in GM will bring the ship’s period nearer to the wave period and possible
synchronism. It would seem that a small GM is safer than a large GM Certainly, a vessel’s
movement is easier and more comfortable when the GM is small, but she is ‘tender’ and could
possibly be made unstable should cargo or ballast shift. A vessel with a large GM is ‘stiff ’ and
has an uncomfortable, jerky movement in a seaway. However, should cargo or ballast be liable
to shift, a large GM is safer than a small GM
where k is the radius of gyration. This can be increased by stowing weights well away from theship’s centre of gravity, g is acceleration due to gravity, GM in metres.k can be estimated as being 0.35 ð Breadth Moulded.It can be seen that if the radius of gyration remains constant, the period can be altered byincreasing or decreasing the GM. As the ship’s period will normally be greater than the waveperiod, an increase in GM will bring the ship’s period nearer to the wave period and possiblesynchronism. It would seem that a small GM is safer than a large GM Certainly, a vessel’smovement is easier and more comfortable when the GM is small, but she is ‘tender’ and couldpossibly be made unstable should cargo or ballast shift. A vessel with a large GM is ‘stiff ’ andhas an uncomfortable, jerky movement in a seaway. However, should cargo or ballast be liableto shift, a large GM is safer than a small GM
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