In attempting to form a FORMULA 20 CLASS in the U S we have inherited some difficult problems to solve .
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.
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 .
-Several would like existing i-Formula rules regardless.
-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.
{-see previous polling post for more info }-
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-The other option proposed is a combination Formula box -and developement rule , with sail area and boat weight ratio scale being allowed to develope .
-Proposed preliminary sail area to boat weight ratio scale for the 20 class -
max, Weight -420 --main 220 --jib --60 --spin 330 sq ft
-mid range -Weight 370 --main 200 --jib 55 --spin 300
-min Weight 320 --main 180 jib 50 --spin 270
-note; shown are max,-mid and min. --all would be calculated based on individual boat weight and fall within this range .
--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 .
-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 .
-Stay hound tang mast locations and max height can be standardized along with max spin pole L .
-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.
--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.
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.
-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.
-note; varied Weight slightly for example purposes ,-as we know mfg. advertised W will vary , each will be weighed.
--N-6/0 --W=420 - - M-Sail 220 - - Jib 60 -- - Spin max=330 + % factor of mast -applied based on mast weight,all designs
-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.
-Tornado sp -8,5 Beam --W-370 -MS =200- Jib 55 - - Spin 300
-note T-could race using it's existing sail plan with larger spin if desired or upgrade its sailplan configuration as listed.
-Inter 20 -W=390 - - MS =208 - - Jib 57 - - Spin max,-312
Inters could use their existing sailplan and upgrade their spin. size if desired.
-H-Fox -W-415 + MS =218 -Jib 59.5 - Spin max -327
-plus % for heavier mast if used ,
note; Fox could sail as is or upgrade to max sail area in any combination.
-Mystere W=400 - - MS =212 - Jib -58 - - Spin max=318
may sail with exs. rig or modify to max.
-H-20 -W=420 - - MS 220 - Jib 60 - - Spin max 330
plus % for heavier mast if used.
; may use exs.rig or upgrade to max.
-P-19 -W=385 - MS 206 - Jib-56.5 - - Spin max. 309
would be competitive with existing rig and upgraded spin.
-Light -W=320 -MS -180 - Jib -50 - - Spin max. 270
Do not believe this option is presented in the previous polling post.
-Can some offer specifics of the negatives and positives of this proposed rule .
thanks -