[Alberg30] Positive Stability Range

[George Dinwiddie]

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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