Alan,
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<br>When you come across a boat that as not been measured in the EU than you use the Texel Excel calculator which you can find at : http://www.geocities.com/kustzeilen/ under de header home links.
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<br>As you can see you only need to weight the overall boat weight, measure waterline length and determine luff length and area of both sails. A good measurement takes time but a quick and dirty will surfice when you are pressed for time. I can tell you how the Texel measures do it, by now they are quick.
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<br>Hobie miracle is very rare in EU and often called Hobie 6.0. However I have a friend that owned a Hobie miracle and raced it. So I can call on him if you want too. Onather option is that you mail this question to Geert Ruesink or Nico Boon whose e-mail adresses are given on the texel homepage. They are the "public affairs" duo for the Texel rating.
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<br>I've been looking at Texel and ISAF closely due to F16HP and can explain you most things about the systems. I must admit that the describtion is somewhat vague and could be worded better. Still Texel is the only system that is publically documented and easily accessable. I had to look really ahrd to find the equations of the ISAF system.
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<br>Mail me at [email protected] or maybe we can have a short phone conversation where I tell you all I know and write down the questions that I can't answer so that I can find that out for you.
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<br>Wouter<br><br>