-1- I used the Texel core so all weights are excluding the spi gear, take a look at the F18, F20, F16 weights as well It is something I want to take out of the system as well as stated in the "Potential other mods" post, but I haven't done it yet. You can pretty much 1 point to all spi boat ratings if you use the weights including spi gear and then subtract 1 point because I will lower the spi hit to compensate. End result ? Zilch. That is one reason why I haven't implemented it yet. I'm waiting on some feedback from others.

-2- I-17R, this is an identified problem point, see the post publicizing the numbers. I'm hoping that US data and Mark Schneider can help me here. I don't have good I-17R with spi data. There is one thing to say for the NMBR rating for the I17R. This boat has almost the same mainsail and mast as the F18's on a lighter platform with less crewweight and a considerable spi. If the fundamental Texel formula is right (Not entirely sure here see post) than the I-17R should be faster in light air ! However I think NMBR makes it too much faster. I feel the cause for this is found in the Texel rating formula itself. Hence my suggestion to do a new regression on the data. In summary; we are working on it.

Also please correct the wrong width for the I-17R ; the sheet says 2.60 mtr. but it should be 2.50 mtr I believe.

>But it is a start,

I would say look at the other things, these seem to work pretty well. Of course it is a bit much to ask to get it right the first time. Some tweaking is required.

Wouter