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Re: Used sail testing
Having objective measurements on a used sail would be meaningless--unless you also knew the same measurements on a new sail. And there the problem is that every loft may be cutting "the same" sails differently, using a different model and of course you know that every loft claims they do a better job and make a physically different and better sail.
So measuring a used sail? That's like measuring a used pair of blue jeans, taken at random. Are they a size 32? So was that a 32 waist when new? Or maybe it was "slim" 30 or "full" 34? All of them are sold as "32". Flat in the butt? Extra roomy? All of them are "size 32" jeans.
Good idea, but given that it is still the rag trade, only rubber rulers can be applied.
Go by the condition of the cloth, if it is still undistorted, unworn, undamaged, then it is still close to what is was when new. Whether that particular cut is optimum, what it was optimized for, even whether it really was for your boat, are all still going to be a guess, unless you've got some kind of documents with it.
(More reasons to take hostages, rob a 7-11, find some other way to just buy a new sail from a reputable source.)