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Class rules allow to put them from min 235 mm from gunwale to max 295 mm. Can someone tell where is the best position for them? Thanks a lot!
Rob, what is youre stock position? 235? 295? 265?I've never seen any information regarding positioning the fairlead anywhere other than it's stock position or as it came on the boat. If your backing plate rotted out put in an inspection port in the back section and fix it.
I think there may be some confusion on how the measurement is done - IIRC, no part of the fitting may be forward of the 290mm measurement and no part of the fitting may be aft of the 235mm. Take into account the dimensions of the fairlead and you don't have a lot of room to play with.
I also don't think it's possible to put the aft boom block in a position such that the load of the mainsheet is pushing the boom forward (trying to bend the mast down low, similar to the effect that the vang has) either by moving the trav fairleads fwd and/or moving the aft boom block eye strap aft within the rules.
You can argue that moving the trav fairleads aft and boom block eye strap fwd may allow the boom to be pulled closer to the deck (Bending the mast more) which might be helpful for lighter sailors, but again, I think the tolerances within the rules make it so that's it not a measureable diff.
Alan can certainly clear up on how the fittings have to fit within the max/min dimensions of the rules
On my 2009 vintage boat the max dimension is 274mm. The min dimension is 254mm as the fairleads are not perpendicular to the centerline of the boat.
It is my understanding that you are not allowed to reposition the fairleads as this would be considered a modification to the builder supplied equipment.
I vaguely remember some earlier discussions indicating that positioning the fairleads as far forward as possible would be advantageous.