We've got a Harken Mk IV and it seems to "slip". We have two reef marks on our genoa. We'll reef to the second reef, and after a couple of hours it will "slip" to the first reef. Here's what our rigger said when I asked him to look into it:
The new Harken furlers have a really nice independent tack swivel- the extrusions rotate with the drum, but the tack is free to spin until the luff 'catches up' with it. I think when furling, the sail is rolling up ok and leaving the tack behind (as it should) to flatten the sail during reefing. But, later on with more wind, the sail rolls tighter and tighter giving the result of more turns needing to be added. It would appear that it is slipping, but it is really just getting a tighter roll on the extrusions. Does this make sense?
In short, it is working fine but you may need to pre-roll a few more turns than you think necessary to accomodate this tightening.
Personally, I don't like the fact that my sail slips in heavy wind.
s/v "Pelican" Passport 40 #076- Finished Cruising - for the moment -
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