[Alberg30] Positive Stability Range

Fri Mar 7 06:52:59 PST 2003

I did not know George Burns ripped that one off.

>>> sail_505 at hotmail.com 03/05/03 04:02PM >>>
Alfredo said: "If someone had told me in HS that geometry is used to 
determine sail area, I probably would have paid attention during
class."

Is that kinda like "If I knew I was going to live this long, I would
have 
taken better care of myself". Mark Twain

Mike Lehman
"Gilleleje" #505

----Original Message Follows----
From: Alfredo <nj95gxe at yahoo.com>
Reply-To: Alberg 30 public list <public-list at alberg30.org>
To: Alberg 30 public list <public-list at alberg30.org>
Subject: RE: [Alberg30] Positive Stability Range
Date: Wed, 5 Mar 2003 12:38:15 -0800 (PST)

If someone had told me in HS that geometry is used to determine sail
area, I 
probably would have paid attention during class.
Thanks again for all the input. This is really fun.
Alfredo
  Dave Terrell <DTERRELL at message.nmc.edu> 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 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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