"The strong points of the Isotope are that its balanced helm allows it to out point any other catamaran to windward". LOL. A real F16 class winner they have their. FYI, the Viper is more than 6 years old, probably a 8 or 9 year old design, there are boats from 2009.

Anyway, on SCHRS, it does punish single handing in many cases fairly 'harshly', on paper. For example, we have a Viper F16 that races solo but in the doublehanded configuration (with jib). His rating is 0.964 when you plug in the Viper F16 data into the formula (the data on the SCHRS website), then plug in 1 and 1 for # of crew and # of crew trapezing. That is very very slightly slower than a Nacra 20. You can see the results here: www.wrcra.org

On the water results tend to suggest this configuration is fairly similar in speed to the N20 across a wide range of wind conditions (neglecting sea state, it is fairly flat where these races occur).