Wouter,
Thanks for your comments and your comparison between the Taipan 4.9 and I17R.
Just to correct a minor error in my earlier post, I accidentally posted Righting/Heeling moment for main + jib instead of main only for these boats.
The correct numbers (according to my calculations) are:
Righting to heeling moment for cat rigged boats:
I17R: 127
TF16: 129
If the I17R is only 315 lbs (as some claim by personal measurement on bathroom scales) lbs instead of 335 lbs, then the I17R R/H becomes 124 instead.
Jerry