Quote:
Originally Posted by coopec43
want.
Regarding the boat that capsized can that be put back upright by "re-ballasting" or something like that? (Maybe tugs/anchors?)
Will get back to you
Cheers
Clive
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I'm beginning to understand what might have happened with the car carrier.
Reports now surface saying she initially ran aground.
....IF the
Engineer tried to quickly debalast from a stability perspective it would be like the " Critical Period" in
drydock stability, when a ships
keel first takes the drydocking blocks and experiences a reduction in metacentric height.
This explains it better.
So what happens during the critical period and why?
When the ship’s stern just touches the
keel blocks, part of the ship’s weight is being borne by the keel blocks. The contact between the stern and the keel block creates a normal reaction or upthrust. The magnitude of this upward normal reaction increases as the
water level in the dry
dock reduces. It is this upthrust that creates a virtual reduction in the metacentric height of the ship. Hence it is very crucial to maintain sufficient positive metacentric height before
docking, lacking which, the ship may heel over to either side, or even slip off the keel blocks and
capsize.