There is a millimetric work on a leach opening. The freestyle needs that leach tension and downhaul to execute manoeuvres, the slalom sails need that position to have the perfect leach tension to have the S-shaping working. These sails are made for zero compromise. Slalom sails have one clew position just like the freestyle sails. The lower clew will help open the leach from the boom directly but very constantly to keep a light feel and not suffocating speed or acceleration. The less downhaul is providing a deeper front profile to have more drive in the bottom turn and a closer top leach to give more power to the board in the carves and be more precise in the moves. For wave sailing, you will therefore use the lower clew but at the same time 2-3cm less downhaul setting then the max. The higher clew will balance the opening of the leach giving back stability, more power to push on the fin to stabilize the board and control over the bumpy surface. The extra downhaul force will open more the leach allowing a lighter feeling when cruising, higher speed to jump higher. For Bump and Jump you will need to pull the downhaul to max setting, and the upper clew. In this case when using the different clew positions, you need also to change the downhaul setting. These are put to use the sails in two modes. On the wave sails there are two clew positions. The acceleration will be loss as the less tension will make the sail less reactive, but it will allow you to sail with winds stronger by 1-2 knots than the optimal use. Not enough time to depower the foil, not enough time to change the sail, by using the lower eyelet the sail leach will have even less pressure and give further release. The lowest eyelet clew is what we could call survival position. There will be less back hand pressure and therefore less push the board and foil, resulting in less lift, more control, more acceleration. In our case the middle clew starts releasing tension from the leach, therefore batten 5 and 4 starts to be more open, and this will give a flat exit at the back to have the wind to flow out faster. It can be used if the foil is not delivering enough power in light wind, or to go more upwind. This gives more backhand, and more power. The top eyelet allows in this case to have the sail tighter on the leach. A foil itself, can have lots of different set ups to allow more or less power, therefore the sail needs to give more options to follow the trim needs of the foil. Our foil sails have three, therefore more options than the other sails of our range. Two for our wave sails, and one for our slalom sails. Let’s start with our foil and hybrid sails that have three. Therefore, the lower you go with the eyelet the less tension the leach will have, the more acceleration and release but also a loss of stability could be possible, but it depends on how the sail is developed. More tension could mean more stability, but also more power. In general, the higher the clew eyelet, the more tension goes to the leach. The difference is there to supply different tension to the leach of the sail to fit either the style of the rider, the power needed to push on the board, or according to the needs of the conditions.
If you are tall you use the high clew position, if you are shorter you use the lower clew: Wrong! In most sails the average is normally two eyelets, but why are sail models having a different number of clews and why more options? We need to attach the boom to one of these, but in which one? You may see a different number of eyelets in sail’s clews. Why some sails have one eyelet and others up to four eyelets on the clew.
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