[quote=Edchris177]Draw yourself a simple triangle, then do the math.
You can only use Pythagoras, A sqrd + B sqrd = C sqrd), with the mast vertical. Law of sines, & co-sines will give you the numbers with mast less than vertical, (ie not a "right" trianlge).
If you measure the chord of your sail, over several spots, you can average what we term in transport category aircraft as the Mean Aerodynamic Chord, (MAC).
I think you will find that the center of effort over the MAC with the new sail is very small. It will take very little mast rake adjustment.
Order the new forestay 1" shorter than factory.
Moving the forestay pin a hole or two should be plenty. I think with 10 hole adjusters, you will have adequate adjustment.
Time on the water is your friend. Take the boat out & sail, then move the mast 1 hole & see if you like it better.
Take some notes, match wind, then rake 1 hole. A GPS & a bingo chart & grease pencil is better than memory.
In the end, simply sailing, in light to big wind will show you where you want the mast rake.[/quote]
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