Seam shape pre-bends the battens and has more low end power as the wind does not need to bend the battens to get shape. When set full, a rotational sail can be hard to rotate and become even more unstable, also the mast pocket does not line up with the sail well anymore, losing efficiency.Ĭontra: depowering and drag down the line Also the stability of the sail then relies only on batten profiling, with a reduced top end control as a result. But, as battens them selves want to stay straight, such sails require more wind to power up. Pro: Depowering and less drag down the lineīatten rotation allows the sail to become flat without wind so the sail can depower when needed. Wave sails can get shape either through batten rotation or seam shaping. Or better said: mast length is more important than boomlength or surface. The first 1/3rd of a foil delivers 2/3rd of the power. So important to keep the lee side smooth. The lee side of a foil delivers 2/3rd of the power. a sail converts wind into power by bending the airflow. Remember to loosen the halyard tension on furling genoas before you go home.A BIT OF SAIL THEORY There are a few basic guidelines for sails (or any foil really): Moving the draft aft gives a finer entry, which is better for pointing ability in flat sea conditions. Easing the genoa halyard will move it aft.ĭraft forward gives the genoa a rounder entry which means that a sail is more forgiving of course alterations especially when sailing close hauled and in lumpy seas. Tightening the genoa halyard will move the draft forward.
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