I personally think that the extra weight does make a difference, however much of it has also come about by the extra volume in the hulls (extra glass = more weight). As proven by the Viper’s competitiveness, the more volumous hulls are an advantage and offset the extra weight.

If the boat was build down to 115kg, it would be quicker but this will come at a price. Got to have boats on the water to win. I would love to see a full carbon Viper. Don’t think I would like to pay for it though.