[Alberg30] Positive Stability Range

[Bruce Dart]

That screening formula number (and a number of others)
is available at the following site
http://www.image-ination.com/sailcalc.html
where you can look up and compare a large number of
sailboats.

Bruce Dart
s/v Wings O' Morning
Cape Dory 25 Hull #755
(yes, I know it's not an Alberg, but...)
--- George Dinwiddie <gdinwiddie at alberg30.org> wrote:
> John Birch wrote:
> > "The Desirable and Undesirable Characteristics of
> Offshore Yachts" has a
> > screening formula. That formula was applied to
> about 50 different yachts by
> > Practical Sailor about 12 or more years ago. The
> A-30 came in second being
> > marginally beaten out by the Ludders 44. The A-37
> came in fourth. The
> > threshold was to have a screening number as far
> below 2 as possible. The
> > A-30 was 1.6, the A-37 1.62.
> 
> That's interesting.  I didn't know about that list.
> 
> > That measure, the roll screening formula, was to
> determine the propensity of
> > a vessel to come back up (right side up) in the
> event of a knockdown or
> > roll.
> 
> As I understand it, the formula produces an estimate
> of the number of 
> seconds a boat inverted to 180 degrees will take to
> right itself given 
> wave action.
> 
>   - George
> 
> -- 
>  
>
----------------------------------------------------------------------
>    Hope your road is a long one.                    
>    George Dinwiddie
>    May there be many summer mornings when,      
> gdinwiddie at alberg30.org
>    with what pleasure, what joy,                
> http://www.Alberg30.org
>    you enter harbors you're seeing for the first
> time;
>                                             from
> 'Ithaka' by C.P. Cavafy
>  
>
----------------------------------------------------------------------
> 
> 
> 
>
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