I have a Jotz jib that has a wire inside the luff. The halyard pulls on the wire and the sail cloth is fixed to the wire with a lashing.
I was sailing last night with the setting sun showing the shadow of the luff wire. I noticed it was not under tension because I could see it making a series of S shapes inside the "hem" of the sail at the luff. When I pulled tight the halyard (single purchase) I could make the curves almost disappear. The luff did have less sag, but I began to wonder:
With a setup like that, what am I aiming for with the adjustments? And does this setup ask for a purchase on the jib halyard?
My mast has a mast-jack, so that there's a single value for the overall rig tension. That seemed about right for the conditions, but I'm open to suggestions how I could verify that. With the luff wire, I should be able to selectively increase the effective forestay tension, giving me back some relative adjustment between forestay and shroud tension.
I've gotten some head wagging-style advice from the local set of dinghy sailors, a somewhat eclectic group with relatively wide-ranging experience in terms of different boats and rigging, but not with the DS or the mast-jack system. So I'm curious what the group here will come up with.