Spin area scale applied -
current Texel -
For boats up to 22 ft. (6.71 m.) provided with a spinnaker the rating will be lowered with 4 points, if the spinnaker area and the spinnaker boom satisfy the following conditions.
Maximum spinnaker area
Boats up to 16 ft <4.87 m.: 17 m2
from 16 up to 19 ft. >4.87 m. <= 5.80 m.: 21 m2
from 19 up to 22 ft. >5.8 m. <= 6.71 m.: 25 m2
For catamarans who use spinnakers larger than the stated limits, the spinnaker sailarea will be rated at 11% effective, and added to the total sail area. This means that the deduction will always be more than for spinnakers which are within the limits. The deduction depends on the size of the spinnaker.
end Texel -
--proposed revision for N A Texel Rating
Texel changed its base rating formula in 02 to correct a bias towards lighter weight boats in its base formula, but differences exist between lightweight spin boats and heavy.
-The rule currently applies a 4 point factor to all catamarans per targeted spin. size limit per length catagory ,
irreguardless of boat weight . Spin and non spin boats are differentiated with 4 being an average applied , weight is a factor in downwind speed.Large weight variation of boat weight exist between the same L spin rigged boats. The consistant factors being RW -RSA -along with L -per spin L catagory .
A needed addition proposed may be a Weight to Spin area ratio applied to the av. 4 point spin use. Simple RW to Spin A ratio.replacing the targeted spin area catagory and 11 percent RSA penalty for spin sizes over current targeted sizes per existing rule .
This would allow heavier spin boats to compensate by having a larger spin , and conversly light weight boats to reflect added advantage with spin rather than a set average for all .
The W to Spin Area ratio would base from 4 and vary approx. an added point in either direction on average .
Would like some advice -recomendation on this simple applied W-Spin A ratio formula .
Formula Classes are accepted with the base rating under Texel -see 01 changes ---basic spin sizes per rule are established . Spin sizes do vary in Formula Classes per weight . This proposed rule change would be complimentary and integral with Formula concepts as accepted.
The genius of this type of rating rule is to allow catamaran design the option to modify and update and develop -per A Class -Tornado Class and other cat classes with longevity due to allowing update and modification. -
One way for all catamarans to update and modify is to target the same rating number as other catamarans in length catagory ,-added spin -snuffer systems ,-modern mast -sailplan -board -rudder configurations making them competitive with current design . Again the genious and another advantage to this handicap rating system along with it being much more accurate ,-proven ,-complimentary and integral , and directing the sport in a much more positive direction with the ideals of racing per ISAF rules -.#2
-summery -
3 basic revisions to current Texel proposed for use in N A
a W to Spin Area ratio formula needs to be worked out per concept outline
a WINDSPEED MODIFICATION FACTOR -high and low as proposed in outline .
3-a handicap added factor based on corrected DPN rating applied to older cat design in original form meeting specified design criteria common to older design. -
-Once the Spin Area to weight formula is finalized -
and a system outlined for applied added handicap to older original design catamarans .
Then a few non international class types will be recalc -
followed by a revised boat list with N A Texel Ratings
-for comparison in use .
Carl
