Here is the rating correction for the 12 foot wide SC20 over the earlier presented 10 feet wide numbers


New specs

weight 200 kg (441 lbs)
length 6.10 mtr (20 foot)
width 3.66 mtr (12 foot) (This is some mightly wide boat)
Mast 11.5 mtr (38 feet)
Mainsail 22 sq. mtr. (236 sq. ft.) luff being 11 mtr
Jib 6 sq. mtr. (65 sq. ft.) luff being 5.5 mtr.
+ spi


New ratings SC20 at 3.66 mtr width

Light weather 88
heavy weather 89

Compare this to :

SC20 at 3.05 mtr width

Light weather 88
heavy weather 92

And the US I-20

Light 92
heavy 95

If we take the spi off the SC20 than :

Light 91
heavy 93

I think this reflects the (scarce) real life data well. At least heaps better then PN of 64.1 vs that of 59.2 to the US I-20

Notice how the new width didn't change any off the light weather ratings (No trapezing group); only the strong wind ratings (Trapezing group).

Again we needed only a few seconds to get the new numbers.

Also interesting is to compare the "sc20 at 12 feet width" numbers tot the ones of the M20

M20

Light 86
heavy 90

So the M20 is expected to be 2 points faster in the light stuff and a fraction slower (1 point) in the heavy stuff.
The M20 has a 4 point rating swing from light to strong and the SC20 only 1 point. This all due to the ratio between rig and width. The Hobie 16 (L = 116 ; H = 114) of course has a opposite swing (getting faster) of 2 points. So the difference between the M20 and the H16 reduces from 30 points to 24 points when the wind conditions transitions from no trapezing conditions (light winds) to Trapezing conditions (heavy winds). The difference between the SC20 and the H16 only swings from 28 points to 25 points. To go one further US I-20 (L92-H95) vs H16 : difference goes from 24 points to 19 points. However the difference between the H16 and a nacra 5.0 remains about the same (0 point differnce to 1 point difference). Both of these speed up equally due to changing wind conditions.

Isn't this reflecting what we see on the race course ?

Wouter