The Viper is clearly the best "F16" boat at the moment and its 20kg heavier than the F16 rule permits as a min.

So if it can win regattas at its design weight of 125kg and its design handicap of 1.04 then I fail to see any advantage in using another F16 design that is slower on the water and has a worse handicap.

It may be possible that if you added 20kg to another design it wouldn't suffer as much in performance as it gains in rating...

And I too had a chuckle at Wouter's little comment at the State of the art F18.... I love them as a class but to call it state of the art is just a little out there!