Overall, I'm worried that you are overthinking things.
GL - I laughed out loud when I read this comment last night, because I was thinking that all of this just seems much harder than it should be.
My original post on this thread I was just looking for 3 measurement numbers...
Are there main sail measurements (luff, foot, leach) in addition to those listed on the certificate?
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If you and I were sitting around a table, or on a phone having a conversation on this topic it would have taken less than a minute to resolve, maybe two minutes. On an Internet forum questions and answers sometimes are hard to interpret in context or the questions / answers seem to take a life of their own... the answer was in the diagram you posted... Luff 20' 6", Leech Chord 21' 9", Foot 10'
From several previous posts this summer I've mentioned that the sails (main & jib) on the SLI boat seemed too big for the mast & boom, maybe a result of the tabernacle conversion (??), but not sure. They are North Racing sails plus a spinnaker, they are in pretty good condition, and sail well. Sails for #2444 seem to be newer (but not sure), Intensity brand sails, but no spinnaker. Now that I have the main sail measurements I can measure both main sails and see if that information provides me with any new insight, e.g. maybe the main sail is actually too big, helping me make the decision on do I swap sails when I sell one of the boats. Just going to roll them out on the lawn and take measurements.
GL - you have helped me a great deal with all of your forum replies / sharing your deep DS knowledge base this summer to my still occasionally newbie type questions, and
I really do appreciate all the information very much. Thank you!