For iGRF: New tunnel hull dinghy concept

Yup, so the powers that be changed the rules to outlaw it 

And just look where their other 'edicts' for the good of the sport soon got them ... disaster and rapid decline snached from the jaws of wild success.... so long ago now I can hardly remember who exactly was involved - probably just as well....   

So how on earth would it work on a reach or downwind - always flying one side of the 'hull' ?   Sounds tricky because if you don't it inevitably has the hydrodynamic shape of a brick  - complete with 'toed-in' foil(s) to put a further damper on progress.   

The only variant of this I've ever seen work well was Shaun Cox's unique board more than 25 years ago with 2 'bows' coming to a common aft section with conventional single pivoting board.  It had a fair bit of rocker and this allowed him to sail it relatively flat on the reach and/or offwind by keeping the bow(s) largely clear of the wet stuff.   It worked very up and down wind. 

My logic for not wanting a catamaran was simply because they nearly always trip over the lee hull and cartwheel in the waters off here when you're punting them hard, so I wanted the benefit of twin hull without the negatives, I still think that part of the idea is relevant, what was questionable was going for planing hulls rather than rounded displacement..

So, presumably the boat simply looks like it isn't pointing very high, but the leeward hull is facing the same way as all the other boats?

Why go to so much trouble to design something just so it isn't a catamaran?

yeah I did a design concept for V2+ ...  triangular, asymmetric boards - i just have to find it!