What sort of cat hull would you use?? How about a tunnel hull?? Point me to some plans or even some pics of the type of hull you are refering too.

I realise the full size turbine powered hydros use a turbo shaft like a turbine chopper but I was hoping my hydro would float about an inch ABOVE the water so a stardard marine prop just wouldn't cut it.

How about a hydro foil type boat, now that would be fast (Assuming it ever got fast enough to get up on the foils.