Changes

This Comfort Factor, developed by Ted Brewer, predicts the overall comfort of a sail boat when it is underway.<ref> Ted Brewer Yacht Design, http://www.tedbrewer.com/yachtdesign.html</ref> The formula predicts the speed of the upward and downward motion of the boat as it encounters waves and swells. Faster motion makes passengers more uncomfortable. As noted elsewhere, [[#Roll Acceleration|roll acceleration] is the primary culprit of seasickness.

The higher the number, the more resistant a boat is to movement, and the more comfortable it is. Obviously bigger boats give a better ride; although the formula favours a narrow beam. Less beam means less [[#Roll Acceleration|roll acceleration]]: the main cause of seasickness. Use with caution analysing power boats.