Some of you have been following the pitching thread might find this
discussion of rolling interesting. It's directed at research vessels but
has a plain language discussion of rolling motions. Powerboaters should
find it informative. For sailors, I would note that sails provide a massive
amount of damping.

http://www.unols.org/publications/ma...ium/motion.pdf

This document is published on the University National Oceanographic
Laboratory System web site. This is the organization of research vessel
operators.

--
Roger Long