We have numerous existing 20 ft cat designs in N A in the 410 to 420 range listed with their basic specs on the F-20 forum, we also have existing iF20s in the 418 wt range with most actually weighing just below, -We have the Inter 20 in the 385to 390 weight range, with a 15 sq. ft larger main than existing If20 designs like the Fox. We would also like to encourage and promote lighter H P 20 designs to evolve within the class rather than see them form as a separate HP class as we are now seeing occur in the 18F Class in separate F-18 and H P 18 Classes.
<br>
<br>-It has been recommended to base the class largely on existing Inter 20 specifications –of main sail 208 –jib 53sq ft. spin 270 sq. ft. as a guideline with more tan 200 existing in the U S presently.
<br>
<br> A sail area to total weight rule allowing trade off of weight to sail area is proposed in amounts to equalize performance ratings and under ISAF and Texel rating numbers. Other Formula classes presently use sail area to crew weight trade off but only applied to larger crew. With a class goal of including all 20s listed and new potential designs through a wide weight range a more comprehensive and inclusive total boat and crew weight to sail area formula is required to achieve fair sailing for all through this varied boat and crew weight range .
<br>
<br>-3 categories are proposed with an additional added in 02 for lighter H P 20s. The first covering most existing active racing catamarans in N A and existing If20 designs like the Fox in the 410LB boat weight and above category with a targeted crew weight average of 330 for a 740 total in category 1
<br>
<br>-Category #2 is all cats similar in weight and general specifications to the existing U S version Inter 20 using a base boat weight of 380, + av. crew weight of 330 to a total of 710 LB. –Per existing I-20 specs. Similar sail areas would establish the base for all weight classes, Category #2 –mainsail 208 sq. ft inc. mast –jib 53 –spin area 275 sq. ft.
<br>
<br> Category #3 would drop an additional 30 LB. To a boat weight of 350LB-+av. Crew weight of 330LB to a total of 680 LB., New designs are presently being built in this category. Proposed sail area to weight formula per 30 LB increments in each category are 3 sq. ft jib –10 main –and 25 sq. ft in spin. Sail area.
<br>
<br>-Category 3 ---MAIN = 198 SQ FT ---JIB =50 SQ FT ---SPIN =250 SQ FT --TOTAL WT 680 LB.
<br>
<br>-Category 2 ---MAIN =208 SQ FT ---JIB 53 SQ FT ---SPIN 275 SQ FT ---TOTAL WT 710 LB
<br>
<br>-Category 1 –MAIN 218 SQ FT --JIB 56 SQ FT --SPIN =300 SQ FT –TOTAL WT 740 LB.
<br>
<br>-note; sail areas proposed to be revised per ISAF rating and designers recommendations .{pending final revision }
<br>
<br>-SAIL AREA notes; -All designs may trade equal amounts of sail area from main to jib to allow sail plan design options and existing modification.
<br> -All teams will be allowed one additional sail of each type.for any race or regatta as a replacement,.
<br> -All sails to be labeled per size in 2 inch easily readable form at the tack next to the sail makers logo, all new sails to be listed and signed over the sq. ft 2 inch sq. ft. number per sail maker.
<br> Roller furling sails and reef points for the main are allowed, as is the spin snuffer.
<br>
<br>-AVERAGE CREW WT. –av. crew weight is 330 LB –crew weight effects allowed sail area per category weight, a 360 LB crew moves up one category and is allowed proportionately more sail area as listed, a 390 crew moves up 2 categories in total allowed sail area. A 390 crew sailing a category 3 lighter boat but equal in total weight as the average 330 crew sailing a category 1 heavier boat but both having total equal weight would be allowed the same rated sail areas. This equalizes total weight to sail area, in other instances it equalizes rated performance. A 30LB heavier crew and boat receives 25 more sq. ft of spin area, -10 more sq. ft of mainsail area, and 3 of jib in any main to jib configuration of equal total sail area.
<br>-Two additional sail area categories will be added at the top for heavier crews sailing heaviest category boats only.
<br>-Category 3 boats will have a min. 330 crew wt until a category 4 is established .All crews may carry weights to maintain the category of their choice. Any boat may race with less than max. Allowed sail areas.
<br> EXAMPLE –applied
<br>
<br> Currently we have the Fox in its existing weight of 418 to 410lb –Category 1
<br> It would be allowed an upgrade from its present 193 main inc. mast to a 218 sq. ft main area or 10 sq. ft more than the Inter 20; currently the Inter has 14.5 SQ FT more mainsail area than the existing Fox.
<br>The Fox would also be allowed a 25 sq. ft larger spin, If a 50 to 60 LB LIGHTER version of the Fox came out the opposite would be true, given similar crew weight to meet each respective category.
<br>
<br>All formula classes are developmental to some extent, this requires racing sailors to modify and target their boat of choice to a particular category set up any way they choose with any combination of rudder boards, sails gear mast rigging or basic platform to class rules outline.
<br>
<br> This proposed formula 20 class does potentially include every active 8.5 beam racing 20 footer within its scope. One large diverse active racing 20 class ideal for distance or buoys racing. One design can be maintained inside it as desired, some will not comprehend formula racing or the merits of it but believe it has the potential to bring in all existing dead boat classes, creates a wonderful opportunity for sailors to refinish and rebuild many existing excellent 20 designs at very reasonable costs . It insures the 200 plus existing Inter 20s will always be part of the racing 20 scene ,and allows new lighterweight exciting boats to be created ,and be able to participate in a large exciting fleet of avid catamaran racers.
<br><br><br>
