Jib halyard tension affects the draft position and groove width. On the CDI furler, which has an extrusion with luff groove, they say to tighten the halyard till the wrinkles are just out. They seem to ignore any question of high or low tension. Does the solid extrusion have some special effect on the jib luff and draft position?
Luff groove furler
- Thread starter Quoddy
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Yes, it certainly does have an effect. However, I think they may be concerned about the effect of a continuous load on the furler bearings. The greater the luff tension, the greater the commpression, and in some cases, the greater the difficulty furling.
Plus replacing the bearings is a bit of work, but is something that needs done ocationally.
http://sail-delmarva.blogspot.com/2009/09/hood-seafurl-800-bearing-replacement.html
Certainly your model is different, but this should give some idea.
When I had hank-on sails or just a foil, I would adjust. With the furler I do not.
Plus replacing the bearings is a bit of work, but is something that needs done ocationally.
http://sail-delmarva.blogspot.com/2009/09/hood-seafurl-800-bearing-replacement.html
Certainly your model is different, but this should give some idea.
When I had hank-on sails or just a foil, I would adjust. With the furler I do not.
I think you mean luft sag not draft position. A loose footed (all jibs I know) does not really have (or need) draft position controls as that is all done with the sheet and sheet controls. Course luft sag is controled by the forestay tension not the halyard so perhaps I'm missunderstanding what the issue is.
Quoddy.... Is your CDI the type with the halyard built into the extrusion that would be difficult to adjust under way? If so, the instructions are simply suggesting a neutral position that will allow the furler to operate satisfactorily.
If the halyard is external, i.e. attached to a swivel at the head, and you can adjust the tension underway, then the trim adjustment features of the halyard should be the same as a hank on rig or a racing foil set up.
If the halyard is external, i.e. attached to a swivel at the head, and you can adjust the tension underway, then the trim adjustment features of the halyard should be the same as a hank on rig or a racing foil set up.
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Nope, he means draft position.
Halyard tension will change his draft position as Tommays says. With enough of it it'll also help with headstay sag but he probably doesn't want the blocks, bearings, shackles, etc. that loaded up.
(I think.) Hi Bill. Headstay tension will mostly control luff (not luft) sag. This'll also be affected by backstay tension if he has one. It'll change draft somewhat.
Halyard tension will change his draft position as Tommays says. With enough of it it'll also help with headstay sag but he probably doesn't want the blocks, bearings, shackles, etc. that loaded up.
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