Posted By: sail6000
proposed 20 class rule options - 11/13/01 08:43 PM
-Equal Performance 20 Class EP20-C
<br>
<br>-Goal –
<br>-To promote equal Formula type catamaran racing in respect with F-16 HT and F-18 class racing in N A –including all the numerous existing 20 ft 8.5 ft beam cat designs in their various design configurations
<br>-and also to work with and include existing F-20 designs and to promote and encourage new designs, participation in the class and general growth of the sport.
<br>
<br>1--problem –We have numerous existing 20 ft active racing catamarans, some in several versions, some with variations of sail area and weight from advertised specifications.
<br> Also we have existing 20 Formula designs, further we would like to encourage and promote new developments in design, sail plans, building technique, and boat performance.
<br>
<br>-Solution =Draft a more inclusive flexible set of class rules.
<br>
<br>
<br>-2—Problem –variations of sail area and weight of listed existing designs.
<br>
<br>-Solution = Allow a limited graduated scale within the proposed class rules of sail area to boat weight ratios.
<br>
<br>-Discussion –We can set a max. rating target in ISAF and–Texel beyond the existing F-20 rating, -possibly a full point faster, this will allow existing boats to sail as they are and upgrade slightly themselves if desired, allow proportional equal performance upgrades in sail area or reduced weight to existing designs, -Existing F-20 s could be upgraded for N A . with larger chutes, or built with lighter components ,-carbon mast etc., New designs evolving have the option of lighter total weight ,- again equalizing all designs within the weight to sail area scale outline.
<br>
<br> Further –We should rely on proven existing ratings calc and design principles in establishing the weight to sail area scale ratios setting proportional max. main jib and spin area limitations. -A suggested weight range may graduate with proportionally reduced sail area from 420 to 320 lbs.
<br>-{note ; working on sail area to weight ratios } . researching existing designs for comparison .
<br>
<br>-Problems –As listed previously this type of design rule historically leads to 3 main undesirable class characteristics evolving over time .
<br> 1-extreme design characteristics {rulebeater designs} -2- cost and expense of these designs –
<br> 3 –fragile lightweight designs.
<br>
<br>-1-Solution –Given existing cat design in respect to other established 16 and 18 Formula Classes setting a max 20 ft Length and 8.5 beam, with sail area and weight being the other main factors in design performance, If we are going to guide or direct future catamaran design by the formation of class racing rules then lets direct them toward lighter faster safer designs which would occur with lighter platforms with less sail area on them, being easier to control particularly in heavy weather and large sea conditions with less strain and wear on stay and beam connections, also being easier to right in event of a capsize.
<br>
<br>-Solution 2—cost –presently per example of numerous excellent A Class and other lightweight durable designs and in larger scale the Boyer Taipan 5.7 for one, with it’s 18.75 ft length has a weight of 275 lbs and is very reasonably and competitively priced. The 320 lower end proposed target weight range for the 20 class would not be unrealistic consistent with cost and strength.
<br>
<br>-Solution 3—fragile or unseaworthy designs --- The 20 Class will often be used in ocean distance races, any cat produced or built should be capable of completing a Worrell 1000 race.
<br>-Min scantling requirements –{min specified strengths of components} may be drafted,
<br>-The class may also reserve the right to require min testing certification per manufacturer.
<br>
<br>-
<br> Problem –Crew weight –
<br>-Solution –The F-16 and 18 classes will attract proportionally sized crews with their smaller more manageable chute sizes. Most racing 20s have experienced larger crew being very competitive on the larger more powerful cats and are used to class min weights we now all sail under, The class may wish to set a min 325 per most existing class rules and allow those below to carry weight to meet min. We all have the option of crew and total weight and can be responsible to maintain our own ideal optimum.
<br>
<br>
<br>-There are numerous other class rules to discuss and define, -these main proposed concepts outlined would form the basis of the new 20 class.
<br>
<br> Please post your constructive optional solutions, or expanded thoughts on existing rules outline concepts --thanks
<br> Carl Roberts
<br><br><br>
<br>
<br>-Goal –
<br>-To promote equal Formula type catamaran racing in respect with F-16 HT and F-18 class racing in N A –including all the numerous existing 20 ft 8.5 ft beam cat designs in their various design configurations
<br>-and also to work with and include existing F-20 designs and to promote and encourage new designs, participation in the class and general growth of the sport.
<br>
<br>1--problem –We have numerous existing 20 ft active racing catamarans, some in several versions, some with variations of sail area and weight from advertised specifications.
<br> Also we have existing 20 Formula designs, further we would like to encourage and promote new developments in design, sail plans, building technique, and boat performance.
<br>
<br>-Solution =Draft a more inclusive flexible set of class rules.
<br>
<br>
<br>-2—Problem –variations of sail area and weight of listed existing designs.
<br>
<br>-Solution = Allow a limited graduated scale within the proposed class rules of sail area to boat weight ratios.
<br>
<br>-Discussion –We can set a max. rating target in ISAF and–Texel beyond the existing F-20 rating, -possibly a full point faster, this will allow existing boats to sail as they are and upgrade slightly themselves if desired, allow proportional equal performance upgrades in sail area or reduced weight to existing designs, -Existing F-20 s could be upgraded for N A . with larger chutes, or built with lighter components ,-carbon mast etc., New designs evolving have the option of lighter total weight ,- again equalizing all designs within the weight to sail area scale outline.
<br>
<br> Further –We should rely on proven existing ratings calc and design principles in establishing the weight to sail area scale ratios setting proportional max. main jib and spin area limitations. -A suggested weight range may graduate with proportionally reduced sail area from 420 to 320 lbs.
<br>-{note ; working on sail area to weight ratios } . researching existing designs for comparison .
<br>
<br>-Problems –As listed previously this type of design rule historically leads to 3 main undesirable class characteristics evolving over time .
<br> 1-extreme design characteristics {rulebeater designs} -2- cost and expense of these designs –
<br> 3 –fragile lightweight designs.
<br>
<br>-1-Solution –Given existing cat design in respect to other established 16 and 18 Formula Classes setting a max 20 ft Length and 8.5 beam, with sail area and weight being the other main factors in design performance, If we are going to guide or direct future catamaran design by the formation of class racing rules then lets direct them toward lighter faster safer designs which would occur with lighter platforms with less sail area on them, being easier to control particularly in heavy weather and large sea conditions with less strain and wear on stay and beam connections, also being easier to right in event of a capsize.
<br>
<br>-Solution 2—cost –presently per example of numerous excellent A Class and other lightweight durable designs and in larger scale the Boyer Taipan 5.7 for one, with it’s 18.75 ft length has a weight of 275 lbs and is very reasonably and competitively priced. The 320 lower end proposed target weight range for the 20 class would not be unrealistic consistent with cost and strength.
<br>
<br>-Solution 3—fragile or unseaworthy designs --- The 20 Class will often be used in ocean distance races, any cat produced or built should be capable of completing a Worrell 1000 race.
<br>-Min scantling requirements –{min specified strengths of components} may be drafted,
<br>-The class may also reserve the right to require min testing certification per manufacturer.
<br>
<br>-
<br> Problem –Crew weight –
<br>-Solution –The F-16 and 18 classes will attract proportionally sized crews with their smaller more manageable chute sizes. Most racing 20s have experienced larger crew being very competitive on the larger more powerful cats and are used to class min weights we now all sail under, The class may wish to set a min 325 per most existing class rules and allow those below to carry weight to meet min. We all have the option of crew and total weight and can be responsible to maintain our own ideal optimum.
<br>
<br>
<br>-There are numerous other class rules to discuss and define, -these main proposed concepts outlined would form the basis of the new 20 class.
<br>
<br> Please post your constructive optional solutions, or expanded thoughts on existing rules outline concepts --thanks
<br> Carl Roberts
<br><br><br>