Under the B-class rules I gave an example of a heavily modified nacra 5.7

But I forgot to mention that B-class rules allow a different setup from a sloop rig that will only really work on in strong winds and reaches and that is having two masts, one behind another.

I would make two masts of 8 mtrs and fit 2 rather high aspect mainsails to them of 11,5 sq.mtr. each. Thus totalling the 23 sq.mtr. limit of B-class cats. Each main will have a short foot of about 1,75 mtrs and be place right after one another.

Now I have totally slashed the heeling moments and pitching moments of the rig thus I can produce a whole lot more power than the standard sloop rig before I'm limited by righting moment or dive tendencies. The two rigs will be very efficient due to their aspect ratio and the slot between the two rig. (slotting is always used on modern C-cats). I could even use wing sails, B-class rules allow it.

Now I hear you say : what about the interaction between the two sails ? And I say that is just what I was after. Most single sail rigs are unable to redirect the wind all the way from the angle of entry to the centreline of the craft. That is why we travel our mains out on reaches. Now by placing two rig behind one another I can double the angle through which the wind is redirected and milk noticably more energy from the air current. It is similar to powering up your uni-rig with a jib on a reach but now the jib is being replace by a more efficient setup.

These two effects: lower of centre of effort and milking more energy from the same air current combined with a considerably lighter craft than a standard Tornado must go alot faster by the same principles that limit the tornado.

And best of it all is that it is still a B-class cat.

It will be a dog upwind, that is definately true and even downwind will it not be "all that" but speed records are never set on those courses anyway.

Just a useless idea that is only fun discussing it.

Wouter