wouter, of course, they are exactly the same, I agree 3x40kg and 2x60kg would have been more wise than just using 100% but just intended to show the principle and assumed everyone would understand that the difference between 148.5 and 150 is only related to the rounding simplification of 33 % instead of 33,3333333 % .

I never stated a tri with the same width as a cat has a higher rightning moment. it wouldn't be wise to make a 16ft wide 18ft cat as the 18sq already suffer from being to wide. my point was that if you want to make a 16ft wide tri, you could increase your rightning moment but it would only increase your performance if your floats are big enough to support that. Of course racks like on the hurricane 6.5 or the swiss lake 27ft catamarans are a more efficient way if it would be only about increasing rightning moment.