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post #11 of 13 Old 09-06-2012
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Re: Tender or Stiff

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Originally Posted by davidlaing View Post
Light displacement is not, in itself, a cause of tenderness. A low ballast/displacement ratio is, but the distribution of the ballast matters, too. A boat with a given B/D ratio and a deeply-positioned ballast will be stiffer than a boat with the same B/D ratio but with a more shallowly-positioned ballast.
You are right that "Light displacement is not, in itself, a cause of tenderness." But a boat's ballast ratio really has almost nothing to 'stiffness' as the term as it is used in naval architecture. As classically defined Stiffness is primarily about initial stability (form stability).

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post #12 of 13 Old 09-06-2012
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Re: Tender or Stiff

A lot of boats particularly older designs are intended to heel at a certain angle increasing their waterline and thereby their speed. Hence the reason for being initially "tender".
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post #13 of 13 Old 09-06-2012
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Re: Tender or Stiff

There's also the Dellenbaugh measurement which gives you some idea of stiffness of a particular boat. It's a calculation as if 1 pound of force was pushed against a square foot of sail (with some other specifics around it being sheeted central etc). Not an exact measurement but does give some indications around how easily a boat heels. Here's a graph for C&Cs for example, http://cncphotoalbum.com/technical/stability.htm shows you that something like a Mk1 30ft is very stiff, whilst the Mk II turned out to be quite tender. Both sail excellently, so it's not really an indication of how well they sail.

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