Hi Marc and Wout -
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<br> Maurizzio on the open forum added a good post on weight ,-costs etc , quotting Dick Newick ,-noted designer of a great many cats and tris.
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<br>-A developemental class would allow a basic rating formula , I-thought the weight to sail area was best . -but --
<br> Not many I am discovering are really interested in this type of developement sailing -racing .
<br> More I am being told will be much more interested and understand one design iF TYPE of rules .
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<br> The interesting twist in devising a developement type rule that would fit N A 20s was to scale existing heavier older active 20 cat designs a larger proportional sail area insuring that they would be competitive , particularly in light air . This would keep them active and already completely qualified to race in F-20 .
<br> The key for newer lighter developement cat designs with smaller porportional sail areas , would be to use that sail area more effectively , --maybe tapered masts would have to be allowed to allow this to develope.
<br> Historically the problem with design developement rules is they create {rule beaters } -extreme designs with unfavorable sailing charicteristics . --
<br> This rule would guide new cat designs towards lighter safer more sail effecient craft being produced.
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<br>-Wout ,-your comment was {unscientific } but if you examine the scale the Tornado 8.5 beam fits into the center using its basic existing sail area . {the T-is used as a benchmark in rating systems . } --The Inter 20 could be sailed as is , and add a larger 2nd chute , --The N 6/0 the same - some would need upgrades in sail area to be competitive at the top level .
<br>--The lightweight version was under existing iF 20S in sail area but 100 LB lighter .
<br> -One thing to mention about Texel and ISAF is that they attempt to rate ALL cats , includind ones with slow features such as low aspect sails ,-skegs , no boards ,ect. where a racing class does not have to concern itself with this aspect , --In this class we have L and B defined , weight and sail area would be the variables , and other aspects are up to the designer and sailor .
<br> Wout if you have run through the Texel numbers at the low and high end of the scale you have pronounced [UNSCIENTIFIC } COULD YOU POST THE RATING NUMBER FOR THEM .,-low middle and top end .
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<br> Again they are a proposed scale that included all existing active racing 20 s in NA basically as they are . and would expect some refinement to be required before finalizing it .
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<br> Thanks
<br> Carl<br><br>