In attempting to form a FORMULA 20 CLASS in the U S we have inherited some difficult problems to solve .
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<br> Inter 20 sailors are not going to convert their sails , made clear from several posts , being in MI with the largest Inter fleet agree , there is no interest in cutting down sail area.
<br> Conversely class rules converted to I-20s sail area will aleinate all other Formula boats , presenting the class as the Inter 20 F CLASS by critics ,plus alienating existing boats for good reason , the existing I-20 with it's carbon mast and 15 more sq ft of sail area is faster .-Trying to ignore this and allow it as a class rule, or under dispensation , presenting this as {fair equal racing } thinking we will get partisipation is unrealistic.The unacceptable option is ignore the 200 Inter 20s .
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<br>-Several would like existing i-Formula rules regardless.
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<br>-Steve proposed a box rule {establishing basic L B sail area and weights }approach with combined crew weight and boat weight rule that several seem to like ,--Several also had critical points of this proposed rule .More specifics should be defined and applied to the various designs for review.
<br>{-see previous polling post for more info }-
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<br>-The other option proposed is a combination Formula box -and developement rule , with sail area and boat weight ratio scale being allowed to develope .
<br>-Proposed preliminary sail area to boat weight ratio scale for the 20 class -
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<br>max, Weight -420 --main 220 --jib --60 --spin 330 sq ft
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<br>-mid range -Weight 370 --main 200 --jib 55 --spin 300
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<br>-min Weight 320 --main 180 jib 50 --spin 270
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<br>-note; shown are max,-mid and min. --all would be calculated based on individual boat weight and fall within this range .
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<br>--As you can see we are proposing an increase of sail area of the existing N-6/0 for example at max 420 lbs. from exs. 264 to 280 max , main and jib ,--including mast area .
<br>-Max. spin area would be 330 sq ft . with a percentage allowance in increased spin area for alum , and heavier masts with added stays or the heavier comptip of several existing designs wishing to keep them rather than modify .
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<br>-Stay hound tang mast locations and max height can be standardized along with max spin pole L .
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<br>-All designs would also be allowed to shift sail area from main to jib in total equal sq ft per weight catagory,allowing some flexability in design . As another example In the mid range weight the 8.5 beam version Tornado at 370 +or - could use its existing sailplan main and 75 sq ft jib with larger allowed spin if desired.
<br>--At the min weight end we are encouraging approx 100 lb lighter designs than existing F-20s with slightly smaller main and jib with equal spin area in respect to current boats.
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<br>Here is the prop. Weight to Sail Area rule scale applied to the various designs listed .-Keep in mind that mainsail area from max may be transfered to the jib area maintaining the total equally to allow design variation, and that a spin area increase { 2 to 6 % }will be added to heavier masted existing designs.
<br>-Note : max spin area may not always prove fastest , we may find a certain aspect ratio spin performs best through a range of conditions given the same hoist height on the mast and spin pole length.
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<br>-note; varied Weight slightly for example purposes ,-as we know mfg. advertised W will vary , each will be weighed.
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<br>--N-6/0 --W=420 - - M-Sail 220 - - Jib 60 -- - Spin max=330 + % factor of mast -applied based on mast weight,all designs
<br>-note ; all existing N-6/0 s could race as they are including the East coast fleet with it,s 348 spin under the mast allowance rule .-6/0s wishing to modify to max sail area over time as listed have that option.
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<br>-Tornado sp -8,5 Beam --W-370 -MS =200- Jib 55 - - Spin 300
<br>-note T-could race using it's existing sail plan with larger spin if desired or upgrade its sailplan configuration as listed.
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<br>-Inter 20 -W=390 - - MS =208 - - Jib 57 - - Spin max,-312
<br> Inters could use their existing sailplan and upgrade their spin. size if desired.
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<br>-H-Fox -W-415 + MS =218 -Jib 59.5 - Spin max -327
<br>-plus % for heavier mast if used ,
<br> note; Fox could sail as is or upgrade to max sail area in any combination.
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<br>-Mystere W=400 - - MS =212 - Jib -58 - - Spin max=318
<br> may sail with exs. rig or modify to max.
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<br>-H-20 -W=420 - - MS 220 - Jib 60 - - Spin max 330
<br>plus % for heavier mast if used.
<br>; may use exs.rig or upgrade to max.
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<br>-P-19 -W=385 - MS 206 - Jib-56.5 - - Spin max. 309
<br> would be competitive with existing rig and upgraded spin.
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<br>-Light -W=320 -MS -180 - Jib -50 - - Spin max. 270
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<br>Do not believe this option is presented in the previous polling post.
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<br>-Can some offer specifics of the negatives and positives of this proposed rule .
<br> thanks -<br><br>