[Alberg30] Positive Stability Range

[Dave Terrell]

the actual sail or the area used for computation purposes? The 189 sq.
ft is derived assuming a right triangle. What sort of triangle is it,
then?  How else can one get 189 sq ft. fore the basic foretriangle
size?

>>> chrishardy at tds.net 03/05/03 08:39PM >>>
Fore triangle is not a right triangle

Dave Terrell wrote:

>My 40 year geometry suggest the following
>
>The fore triangle is a right triangle. This allows one to calculate
the unknown side using the pythagorean theorm. A squared + b squarded =
c squared. If A is 10.5 (J) and B is 36 (I), C is 37. 5. If I remember
the discussion from last year correctly we determined that the real
forstay length was in the range of 36' 8" or 36' 10" depending on the
fitting one has at the deck level
>
>.05 % of the hypothetical forestay length squared gives 70.3 square
feet for the storm sail
>
>.05 % of the real forestay length squared gives 67.7 square feet for
the storm sail - assuming a forestay length of 36' 10"
>I converted the 10 inches to decimals. 
>
>My figures are a bit higher than Cole's figures but I am not sure why
- probably because one does not really use all the acutal length of the
forestay in a real sail and so one should not use the whole length of
the forestay  for calculation purposes. I any case it's fun to actually
use HS math sometimes even if I missed something here.
>
>
>
>>>>GreekSailor at worldnet.att.net 03/05/03 02:17PM >>>
>>>>
>The forestay length is the "I" measurement of the sail plan which is
36'.
>
>Kasia #383
>
>-----Original Message-----
>From: public-list-bounces at alberg30.org 
>[mailto:public-list-bounces at alberg30.org]On Behalf Of Alfredo
>Sent: Wednesday, March 05, 2003 7:59 AM
>To: public-list at alberg30.org 
>Subject: Re: [Alberg30] Positive Stability Range
>
>
>
> Thanks everyone.
>I'm reading about storm sails(Coles' Heavy weather Sailing). It
suggest the
>Trysail to be no more than a third of the area of the main. In our
case 73
>sq feet. And the Storm Jib about 5% of forestay lenght sqared. Any
idea
>about the forestay lenght?
>Thanks again.
>Alfredo
> George Dinwiddie <gdinwiddie at alberg30.org> wrote: Alfredo wrote:
>
>>Greetings,
>>
>>Does anyone happen to know the positive stability range of the
Alberg
>>30?
>>
>
>Back in 1994, Jack Hornor estimated the positive stability range to a
>bit under 120 degrees. Judging from the graph he gave out, I'd say
>about 118 degrees.
>
>>Also, I know the total working canvas area of our boats. But, what's
>>the area of just the main?
>>
>
>The sailplan (http://www.alberg30.org/boat/A30sailplan.jpg) shows a
>figure of 221 sq. ft. for the main. The fore triangle is 189 sq. ft.
>
>- 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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