It depends
Hello,
The range of mast bend varies depending on end fixity (deck stepped vs keel stepped), number of spreaders, masthead vs fractional rig, intended use, cut of mainsail, and for all I know barometric pressure.Ah, variables. Prebend is a simpler matter. Basically, you want to prejudice the middle of the mast forward, so that the aft pull of the mains'l won't "invert" it. A little bend also makes the mast more stable, so it won't wobble fore-and-aft as you hit chop or gusts. On your boat, an inch or two of prebend will be enough to accomplish this. If you have an adjustable backstay -- and you really should -- you can increase this bend to flatten the main as the wind builds, simultaneously tightening the jibstay. But that is a matter for a larger tuning discussion.
Fair leads,
Brion Toss
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