>  Schioning offers kits. They are comparatively despite the use of flat panels very complex to build compared to what an HP could offer.

yeah the flap pack boats are a great example, I had a look at Schionnings flat pack power cat and found it to be mighty expensive ($108k!), but you have few choices to get to a boat that sells for high $200k thru $300k. Not that ppl would do this for an income but resale is an important aspect. In any event I can fault it on the amount of interior structure it seems to depend on for construction.

> To hook onto the gestalt of tris one could as well build a ww hull fusing two front halves of a regular tri central hull butt to butt with an entrance to the side. For the same boat length the interior space is 30% longer in the HP. The superiority of the longer lw hull is the obvious.

Ok there are a few things going on here that needs to be fleshed out, the Tris as I understand them are based on a planing hull with quite a large offset to house the much beamier accommodation.

So the first problem is generating an efficient planing double ender out of flat panels. What I do know is a hull is designed for a speed as that optimises its entry and departure in the sea and for a double ender then thats complicated but not impossible.

I would expect lift from planing is a similar proposition to tris, however what we do have going for us is that the pressure from the rig on the LW hull will via leverage have a tendency to lift the WW hull up reducing wetted surface.

Accommodations rely on different restraints, I think if anything a proa is in front there too but they both share a similar issue. In limiting wetted area both have chosen to limit the underwater beam which impacts on available headroom traverse. No surprises there.

> How hard would it be to reconfigure the sheets and so to allow tacking for round the can races ?

Im sorry I just cant answer that, but I have something to compensate. Its no secret that these boats run on the same formula for speed as anything else, power to weight. These tris use quite large sail areas to produce the speeds they exhibit, eventually like all boats they face their ability to stand up straight, we all know this. Tris in particular have some special limits, their design limits the righting arm and the lee bows have relatively less buoyancy.

On a rising scale subduing stiffness, proas as Rob would be quick to point out can hold off both events until much later. So in the same circumstance more area is better afforded, more power on the same weight is faster.

And one final thing, the idea provided earlier was a proa design on same length hulls, and it has to be said that in some, perhaps most wind and sea conditions it too can put more area aloft. So it does have its assets in comparison to tris.

 

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