3-main topics for adaptation for a N A Texel Rating

1-Windspeed modification factor
1-a -based on beam -and board type

note; S A is governed by rated area

2- Spin area scale applied ,-rather than set limit per L

scale per L Catagory based on spin area per ft .

3 -proposed application of P Rated numbers as an efficiency added factor applied to older existing design in original form based on age and design criteria.
An added percentage based on mean high average in L catagories
Understood P-Rating will correct assumed creveate in system and adjust to more long term historic rating numbers used applied to older design .

Once established list all cat design -classes with N A Texel Rated numbers --review--
, current problem is different points of beginning and scale differences for the P rating and Texel -ISAF Rating , so scaled differences in individual boat comparison would be needed.
The vast number of boats are International Classes and have common specifications and sail areas between continents ,
Some have minor variation of sail plan and require a recalc of base rating , Performance brand cats being the main one .

2--Windspeed ,-above and below 8 mph --trapeze and non trapeze average conditions-

Beam effect = power is directly related to beam in trapezing conditions, so 10 % extra beam produces 10% extra forward drive, but drag is related to the cube root of speed so 10%extra power will result in about 2% extra speed.
Upwind and downwind considerations differ as well as spin and non spin applications . -1.5 for spin av and 1 may be proposed in non spin .
Each will have a recalc for the upper wind speed in catagory .

Boards in current Texel are given 3% in differentiation between board types and non ,-This reflects lower speed ranges but requires a reduction in higher speed ranges also recalc in the upper wind speed mod rating . to 1 % av.
A catagory left for angled lifting foils is also needed in the upper wind speed mod. calc .

-