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How to Tune a Stayed Mast
When tuning your spar, I have been taught to get the mast as straight as you can with a bit of aft rake. With four lower shrouds, the forward lowers should have a little more tension then the aft lowers. This will allow the spar to bend aft if any and that is good, a forward bend is bad because it makes the main fuller as the breeze picks up. Next, look up the groove under sail pressure of about 10 to 15 knots of air on the leeward side. The groove should be straight. Make notes and adjust turnbuckles when the rig is not under strain.
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