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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 02-25-2010
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Harken MK II unit 1

We have Harken furlers on both headsails. The staysail furler works perfect. The genny is giving problems in that it is wrapping at the top swivel. The angle of each headstay is exactly the same. The staysail is on an external block, while the genny is on an internal sheave.

On hoisting the genny, before there is load on the halyard, it begins to move from aft of the stay, to the port side, clockwise at about 7/8's of the way up, toward the front of the foil. At full lift, under load, it has moved around 1/2 turn to the front of the foil so that the halyard attachment is directly forward of the foil. This causes the halyard to catch on the blunt end of the foil as it is rolled up, causing a thumping, binding, feel and difficulty rolling it up. It will roll up but has resistance bumps as it does so. It unrolls OK even though some bumping is detected.

The staysail upper swivel and the genny swivel feel identical and turn quite freely. I have considered a preventer mounted to the mast, and have two on hand, but know that this is a fairly recent problem and no preventer has ever been there. This boat is a 1977. The halyard is in great shape, nearly new. On the old halyard I do not remember a problem. A friend told me that the halyard may have formed a twist or set, near the top and I should install a swivel at the halyard attachment. I have also tried attaching extra shackles to lengthen the pennant at the drum, which did not help.

Last edited by ROSA; 02-25-2010 at 06:00 PM. Reason: spelling
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Old 02-25-2010
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You need a halyard restrainer installed ASAP. If the halyard wraps around the foil, it will destroy the foil and likely the headstay.
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Old 02-25-2010
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Sailingdog, I, for the most part agree with you totally and am preparing to install the a restrainer. I am still confused as to why the the top swivel is walking half way around the foil, without load, when it nears the top, as there is no difference in the specs between the two identical furlers, and why this has only occured after the new halyard has been installed?
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Old 02-25-2010
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I really have no idea, but is it possible that the halyard itself has a twist (or several) in it, making it want to walk around the stay as it goes up? Probably not...just trying to think of reasons it would do that with a new halyard.
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Old 02-25-2010
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on my harken furler for the genny there is a sheave on the mast near the top. the halyard comes over the sheave on the top of the mast & down through the sheave about 6" below. the halyard pulls at an angle on the swivel to prevent it from rotating. harken recommends this if the halyard comes down at too little an angle to the stay. this prevents the halyard from wrapping around the stay.
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Old 06-07-2010
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The Harken retainer has been installed and we no longer have the tendency for the swivel to rotate at all.

The furler still seems to be catching and it is necessary to go to the fore deck and help it past the bind by turning it by hand while the mate is pulling on the furling line. It is now catching maybe once during the furl maybe halfway in, and seems smooth otherwise.

In addition, it catches or binds on the way out at the last turn before the sail is fully out, which again requires a help by hand. This tendency to fail to unroll is there even in 12 kts on a beam reach.

We have both slacked and tightened the tension on the halyard with little change. We have gone up to inspect the swivel and all related gear while the sail is furled. We have lowered the swivel and checked it by hand and it is smooth and free. I plan to go back to the top while the sail is being furled and unfurled to check and see if I see a reason for the bind.

Anyone have suggestions of what else I might check?
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Old 06-07-2010
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Furling line alignment...might be getting and overrun due to it piling up on one side of the drum and then falling and bunching up.
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Old 06-07-2010
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Quote:
Originally Posted by Stillraining View Post
Furling line alignment...might be getting and overrun due to it piling up on one side of the drum and then falling and bunching up.
Yes, it could be the furling line alignment to the drum. The lead seems OK but I may try to adjust it a little. We are going to replace the furling line as it is slick 5/16" line which would have more of a tendency to do that falling thing, and it is also harder to grab and pull.
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Old 06-07-2010
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Harkens are notorious for halyard wrap if you have more than a few inches of halyard at full hoist. Add a pennant to the sail to reduce the amount of halyard showing.
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Old 06-07-2010
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Just came in from checking the furler earlier this morning at the dock. Very light wind blowing, but enough to keep the sail full. No problem at all in or out, smooth as glass.

I am wondering if the head stay could be a little slack under load and if that would affect the furler this much? I know the heat here is stifling at mid day and the head stay and the back stays must be expanding to some degree. I am detecting a bit more slack in the lowers under load.
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