With the rig in the ww hull you have the type of stresses that are found with a trimaran.
With a Harryproa the beams take the stress of the leverage of the mass of the ww hull plus the drag of the windward through the water and air.
A pacific proa setup has the leverage of the ww hull plus the drag of the lw hull that becomes greater as the ww hull lifts. Eventually as the ww hull comes out of the water the full drive pushing the proa along goes via the beams whereas with a Harryproa this drive does not stress the beams.
I would have thought that the pacific proa has to be able to cope with greater stress in the beams than the Harryproa.
--- In harryproa@yahoogroups.com.au, Doug Haines <doha720@...> wrote:
>
> Hi Dennis and Rob and all,
>
> I am looking at Dennis's Maxi trailer 60'er a bit more and see how this could be a better design with the rig in the ww hull.
> Secondly I am not sure, but it seems that there is going to be less stress on the beams if you have the sails on the hull that is getting lifted up. Instead of the sails over on lw hull.
> This is intuitive - I have to mull over a bit on that, but i think the hull and beams will see less loadwhen the wind starts to push the ww hull up out of the waater. It seems an even simpler way of sailing than standard HP - if that was possible.
>
> The down side is having to look up at your sails. I don't know what other changes it would mean.
>
> Doug
>
> --- On Tue, 28/12/10, Dennis Cox <dec720@...> wrote:
>