List: trawlers@lists.trawlering.com
From: twl@halwyman.com
TWL: RE: Too much on top
Sat, Jul 28, 2001 5:25 PM
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on stability in some cases.
Increasing the roll moment makes the roll period longer, and thus the boat
less "tender". If a boat has an excessively fast roll period it will
quickly respond to, for example, a beam sea. A longer roll period can allow
beam seas to pass under the boat before a roll can have a chance to develop.
The solution to a problem with too quick a roll period? Increase it by
adding weight away from the roll axis.
This is usually most easily done by adding weight up high which can have the
undesirable effect of decreasing the stability range so it is certainly a
matter for a qualified marine architect to consider.
I also agree with Mike that stabilizers are no substitute for stability, but
even in a properly designed, very seaworthy, round-bilged displacement hull
roll is usually a problem, but from a comfort, not a safety, consideration.
In my opinion any owner-operated motor yacht going offshore must be
stabilized for comfort, unless in the hands of a solo masochist.
Captain Hal