New mast rake and prebend

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Sadly I don't have the foggiest idea... I have only played within the constraints the builder left for the owners I have never tried to define them. My guess is that if you start out by matching the rake and prebend of your old sails you will at least be in the right neighborhood. But I suspect it just depends to much on the boat to make sweeping generalizations.

Just from personal experience, the J-35 used to sail with reasonable amounts of rake and 2" of prebend, then someone figured out that 16" with almost no rake was faster...

I get the builders suggestion though. That location would be zero rake, which is the absolutly furthest back the mast will ever be, and much further than I would expect. I might suggest putting the back edge between that position and directly under where the mast would sit if it was centered in the partners... but that's the best I can do.