Or, put another way - shorter, narrower, smaller sails, 20 yo design and only 7kg lighter - how could it possibly be as fast?

As for a cat rigged Taipan being rated faster than an F18 - I know which one I'd choose in a boat for boat race. It makes me think the SCHRS is weighted very favourably for the bigger cats.

Or is it just heavier cats?
In the Mozzies we have a "heavyweight" division for older boats, where the minimum weight is an extra 10kg. How do the Mosquito numbers come out with 10kg of extra weight added? I'd be interested to see the difference.