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hitch said...
the Flapping of the sail is the sail twisting off in the gust - it gets to a point where the flex of the mast is such that most of top of the sail ceases holding wind & creating pressure - wind passes over both sides of it at the same speed - The bottom half keeps producing power & that keeps you on the plane- they are designed to do this, and that is why you crank more down haul in windy conditions - it flattens the sail and brings the sail to this point more easily/quickly. They are designed so it is progressive - it starts at the head of the sail and works its way down making the sail very controlable. if the top 5% is twisting off it remains quite comfortable and controllable.
If the whole top half of the sail is twisting off down to the boom - it sounds like kind of a rattle/shake at very high frequency like a hiss- then head for shore you are seriously over powered and should take a break. You get the centre of effort of the rig moving downwards sharply and you have to push up with the forward hand to keep it working.
If it is seriously flapping (not a shimmy shake or a rattle) there may be a tuning issue or the mast isnt right for the sail - but I was out there too & there were some very unusual gusts coming through - like a wind shear -everyone had the same issue!
I used to sail in the days before these type of sails - when you were seriously overpowered they just went berserk and flung you up or down & flipped you off the board - ie totally unsailable. - when the monofoil sails came in with the new cuts, they were utterly mirraculous!!! you could get home instead of floundering for a couple of hours.
This is the reason there are far less rescues that there used to be. In the old days if the wind came up quickly and you were caught on the worng sail it could be impossible to get home! - hahaha - progress isnt always so bad!
You are right with this new sails. Even in max 40 knt wind I managed to stay on board with my 5.8 sail. But since I slow down and chop go up and down higher it must looks like donkey riding not proper windsurfing.
But at least I get to bank safely. I can't imagine nothing worst that need to waterstart at this conditions.
Just one more question re harness .
What do you all do in extreme overpower conditions ? your method for survival?
I possibly disengage harness line and try to pull sail with hands only bit to keep board moving in very slow pace.