You are completely right and I will give such a statement more prominance in the final wordings.

Still, the NMBR system allows to rated the two more equally to eachother. Simply by the fact that when using to rating numbers, one for sub trapeze weather and one for trapeze weather, we can assign a heavier hit to a spi in one of the two ratings thus approximate the swing in performance difference more accurately than a single number system can.

It is not perfect but it is already a step up from the single numbers Texel and ISAF systems

It is also a step up from yardstick as experiences gained in one particular class of catamarans (F18 ? to say H16's) can then be easily extrapolated to all catamarans. Also the one with small or inactive fleets.

Please keep the suggestions coming.

I think I have designed a better system already but I KNOW it can be better still ! With your help we can make something really good

Wouter