<<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
