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Author Topic: Sailboat data key  (Read 4963 times)
Pick-up Crew

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Posts: 1
Boat Type: Beneteau First 28

« on: October 24, 2009, 09:40:06 am »

Can somebody explain the key to the data i.e. what is listed SA? , I, J, P and SA/Disp etc,

Thanks in advance

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Posts: 1882

« Reply #1 on: October 25, 2009, 10:38:39 am »

Great idea and one that I have been meaning to provide.  Here's my first draft for 'calculated' sail area. Is computed when I have the individual rig measurements (such as I, J, P etc.) on file. 'Listed SA' is when only a total listed Sail Area is included on a brochure of flyer.  OR, sometimes the listed total SA doesn't coincide with the calculated sail area for any number of reasons.
I need to get back to you on some of the other numbers. 
Ken H.
Member Emeritus

Karma: +1/-0
Posts: 76
Boat Type: C&C 37/40XL & a Laser II

« Reply #2 on: November 11, 2009, 09:39:17 am »

Here is a good reference to answer some of your questions: http://www.tedbrewer.com/yachtdesign.html

And a handy calculator if you want to work out your own: http://www.sailingusa.info/cal__sad_ratio.htm

S/V Salazar - CAN 54955
1990 - C&C 37/40 XL #67
Cape Breton Island, Nova Scotia

Karma: +2/-0
Posts: 1882

« Reply #3 on: November 11, 2009, 10:14:44 am »

Good stuff there.  Thanks for the links.
I noticed that the sail measurement diagram that I added to the site doesn't really correctly display how the 'J' measurement is determined. (should measure from the sheer line - the diagram makes it look like it's measured from the height of the stem).  the drawing is actually a cluttered mess anyway so I will need to do a new one at some point.

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