Sail Area Displacement Ratio

[Craig Urquhart]

I would appreciate some help understanding which numbers and units are used to calculate this ratio. My understanding is that this ratio helps describe relative livliness of a boat, but I have never been able to reproduce published numbers. Thanks in advance.

Craig Urquhart
Satu CD27 #272



Satu@gwi.net

[Dana]

I would appreciate some help understanding which numbers and units are used to calculate this ratio. My understanding is that this ratio helps describe relative livliness of a boat, but I have never been able to reproduce published numbers. Thanks in advance.

Craig Urquhart
Satu CD27 #272

___________________________________


Try S/D=SA/(displ/((64.05)^2/3)) where SA= sq ft of working sails
displ=weight of boat in lbs.

S/D<14......you have a motorboat
S/D~14 to 16.5 (cruiser)
S/D>16.5....you have a racer



darenius@aol.com

[Russell]

The reference in the subject line not only gives the formulas for many of these ratios, from SA/D to prismatic coefficient, but also does a good job of explaining their meaning in an introductory and fun way.

[Catherine Monaghan]

Craig,

You can use this <a href="http://www.image-ination.com/sailcalc.html">sailboat calculator</a>. It will provide you with more information than just the SA/D of your boat. Remember to convert inches (twelfths) into decimal values (tenths) before entering your data into the calculator.

catherine_monaghan@merck.com
CD32 Realization
Raritan Bay

I would appreciate some help understanding which numbers and units are used to calculate this ratio. My understanding is that this ratio helps describe relative livliness of a boat, but I have never been able to reproduce published numbers. Thanks in advance.

Craig Urquhart
Satu CD27 #272

catherine_monaghan@merck.com