Mike ther are a few things you should know when mearuring you sails. I will write them down here.
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<br>First a pictures of the mainsail
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<br>The methode boils down to this :
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<br>-1- you lay the sail flat on the floor with the battens in the pockets but without tension. You tension the sail just enough to take the creases out and pin (nail) it down like that. (In the way that the sail spans the biggest area.)
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<br>-2- you hamer a few nails around the sail on the drawn places.
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<br>-3- you measure the identified sides of the triangles. INCLUDING the very small triangles that span the space between the sail and the nails used for measureing.
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<br>-4- You calculate the total area of the sail by calculating the area of each triangle and adding them up where ofcourse the small traingles outside the sail near the nails are subtracted.
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<br>REMEMBER to calculate; Triangles with only straight sides by 0,5 *base* height (where base and height are perpendicular to each other) And "triangles" with a curved side by using the formula 2/3 * base * height. (where base and height are perpendicular to each other)
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<br>Measureing the jib works the same (go for the picture to the Texel site)
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<br>When you present the rsult please give two area's. I'm not sure wether the Hobie 20 has a large flap underthe mainsail but this area can be substantial but is also found to hardly produce any sailforce. So when comparing mainsails I would suggest that only teh area above the lowest batten is taken in cosideration, So give teh area without the flap and with the flap.
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<br>If you have more questions about this measurement methode please mail me or one of the Texel officials (mail adresses found on the Texelrating site www.texelrating.knwv.nl)
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<br>Good luck
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<br>Wouter
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