Changes

A good amount of freeboard will improve both the maximum righting moment and the limit of positive stability. Too much freeboard will make the boat tippy by raising the CG. Adding ballast to make the boat stiffer reduces the freeboard and reduces the zone of positive stability. Adding ballast to the flybridge, as recommended by one magazine, is absolutely crazy.

The roll period of a boat is an excellent indication of its stability. The lower the roll period, in seconds (s), the more stable the boat. The boat will be more uncomfortable but will have greater resistance to capsizing. The roll period is based on the moment of inertia, waterline length, and beam.

The moment of inertia, (D^1.744/35.5), was developed by the [http://www.sname.org/ Society of Naval Architects & Marine Engineers]. It is very sensitive to the distance items are from the CG.