List: trawlers@lists.trawlering.com
From: schooley@keyway.net
TWL: RE: RE: Too much on top
Sat, Jul 28, 2001 6:06 PM
k a roll period?
Increase it by adding weight away from the roll axis."
However roll inertia is a double edged sword. Although higher roll inertia
slows the roll response it also increases the energy storage, so once the
vessel does roll it takes longer to dampen out. In vessels the size we are
talking about it is impossible to increase the natural roll frequency to a
value higher than the natural frequency of waves, so while you might make it
better for one wave frequency it will be worse for longer wave lengths,
closer to the new natural roll frequency, and the range of motion will be
higher. If your Naval Architect did his job right, he will have optimized
the roll inertia for your application. If it is optimized, then anything you
do to change it will only make it worse. If your Naval Architect didn't do
his job right it will take a better Naval Architect to fix it. I doubt you
will improve it for all conditions by trial and errors.
Sincerely;
Mike Schooley
Trailerable Trawler wannabe