I don't like to let go of not being able to be backwinded.
I was thinking of a rope traveller between the ends of the hulls. This way you could do the tacking bit by taking the puley to the lw hull in light tight conditions and bring it back to near centre whn things are more relaxed. Making the hinge and boomlets strong enough would allow a more acute sheeting angle. Being able to have a schooner rig with this configuration would probably demand this. I don't see why the boomlets couldn't be made as strong as a top gaff without too much weight if skinned with carbon
--- In harryproa@yahoogroups.com.au, Mike Crawford <jmichael@...> wrote:
>
> <<I had a good look at the sheeting arrangements. They sheet way back to
> the stern. This would not really go with the Harryproa configuration of
> sheeting back to the ww hull>>
>
> I would sheet out to a block as far aft on the leeward hull as
> feasible, probably near the end of the solid/framed section.
>
> That would provide nicer angles for the sheets to the top wishbones
> (not too steep), create less stress on the wishbone joints, and make it
> easy to run with the sail on either side of the mast. It would also
> allow the boat to be used as a tacking proa, assuming that you'd want to
> do such a thing, and also that the combination of hull rocker, distance
> between rudders, and rudder depth would allow a tack.
>
> The downside is that it would be possible to get caught aback. But if
> you want the option of tacking, that's the point. The worst case is
> that you'll have to dump the sheet if the wind makes a massive shift.
> But if there's enough wind to warrant flying the leeward hull when the
> wind is to leeward, you should be on the sheet anyway, even if you
> always keep the windward hull is to windward.
>
>
> <<I don't particularly like the wrinkles on the ww side.>>
>
> That might be a necessary evil when wishbones are in position for a
> perfect shape on the leeward side. Fortunately it's the leeward side
> that really matters. Given that the joint on the windward side is
> already in a relatively dead zone, a few wrinkles at that point on the
> windwoard side should be a non-issue.
>
>
> <<If the timber wishbones were skinned with some carbon tow>>
>
> Nice thought. The quick build time of plywood and spruce wishbones,
> combined with the strength of carbon.
>
> - Mike
>
>
>
> On 5/28/2010 11:56 PM, robert wrote:
> >
> >
> > I had a good look at the sheeting arrangements. They sheet way back to
> > the stern. This would not really go with the Harryproa configuration
> > of sheeting back to the ww hull. Posssibly sheet back to a pulley
> > midway betweent the two bows. I suspect the hinge would have to be
> > made extra strong to handle the different sheeting arrangements. If
> > the timber wishbones were skinned with some carbon tow, they should
> > handle the extra loads. It would probably be worth it aiming for an
> > optimum leeward shape.
> > I don't particularly like the wrinkles on the ww side. Possibly
> > cutting the sails on the bias could smooth things.
> >
> > I am concerned about the sheeting angles. Hopefully Gardner can sort
> > it out before I commit.
> > regards,
> > Robert
> >
> > <mailto:harryproa%40yahoogroups.com.au>
> >
> >
>