2:35 AM
sailboat comfort ratio
The comfort ratio formula is as follows: displacement in pounds / (.65 x (0.7 lwl + 0.3 loa) x b^1.333). brewer says ratios vary from 5.0 for a light displacement daysailer to the high 60.0's for a super heavy ocean cruiser.. Motion comfort ratio was developed by boat designer ted brewer. the formula predicts the speed of the upward and downward motion of the boat as it encounters waves and swells. the faster the motion the more uncomfortable the passengers. thus, the formula predicts the overall comfort of a boat when it is underway.. Comfort ratio: this is a ratio created by ted brewer as a measure of motion comfort. (100% fore triangle) and disp/length ratios to create a guide to probable boat performance vs. other boats of comparable size. for boats of the same length, generally the higher the s#, the lower the phrf. under 2 - slow, under powered. 2-3 - cruiser. 
sailboat comfort ratio In sail's new sailboat review, we typically calculate ratios using the mainsail and 100% foretriangle area. on occasion a boatbuilder may publish sail areas and displacements that are larger and lower than nominal so as to maximize a boat’s sa/d ratio in the interest of making appear to be higher performance.. Putting this all together, for bluewater cruising, from my perspective, my preference is for a boat with a motion comfort index of 30 or better, preferably closer to 35 or more and lloyd’s register rating of category a ocean.
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