Comfort ratio??

[Trevj]

As well as things like Disp/Sail Area ratios and other physical measurements I have heard of things such as comfort ratios.
Where can I find such definitions and hopefully some interpretation of the values obtained.
Thanks in advance

 

[Strathglass]

You will find the info you want here
<A target="_blank" HREF=http://www.image-ination.com/sailcalc.html>http://www.image-ination.com/sailcalc.html</A>

 

[AndrewB]

There are a whole set of these design indices, including the 'comfort ratio', together with measurements for approx 1000 (mainly US) yacht designs, here: <A target="_blank" HREF=http://www.johnsboatstuff.com/Articles/design.htm>http://www.johnsboatstuff.com/Articles/design.htm</A>

 

[Trevj]

Thanks for your help. The Java applet on <http://www.image-ination.com/sailcalc.html> gave the following results for my boat:
BoatName=Top Hat 25
LOA=25 LWL=20.5 beam=8 displacement=6048 sailArea=286

displacementToLWL=313 speed=6.07 sailAreaToDisplacement=13.79
LWLToBeam=2.56 motionComfort=26.62 capsizeRatio=1.76 category=cruiser

That reafirms my idea that under working sail (main + no.3) she is a great little cruiser.

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[polarity]

Ted Brewer invented the Motion comfort ratio :

The CR is : Displacement in pounds/ (.65 x (.7 LWL .3 LOA) x B1.333). Ratios will vary from 5.0 for a light daysailer to the high 60s for a super heavy vessel, such as a Colin Archer ketch. Moderate and successful ocean cruisers, such as the Valiant 40 and Whitby 42, will fall into the low-middle 30s range.


More details here on that and a lot of the other ratios : http://www.tedbrewer.com/yachtdesign.html

PAul

<hr width=100% size=1>Paul
<A target="_blank" HREF=http://www.polarity2.com>http://www.polarity2.com</A>