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 Downhaul on jib with CDI furler		  New Topic  Topic Locked
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Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts
Initially Posted - 04/12/2013 :  19:26:01  Show Profile  Visit Arlyn Stewart's Homepage
I received mail asking about a jib issue and thought it might be helpful to review an issue regarding the CDI furler. I don't know which furler is currently being supplied by Catalina but know that there are a number of CDI units in service.

From my experience, I was unable to adequately tension the luff with the integral CDI furler halyard and got good advice from a local rigger to solve the problem. Instead of of using either a pig tail or shackle to set the jib tack to the furler drum, he suggested using the halyard to position the sail and then using a 1/8" down haul line. Yeah, I know... how could that possibly be strong enough?

The deal is, it gets roved three circuits around the drum eye and the tack. The result is a block and tackle with considerable purchase to downhaul the luff for the strongest sailing conditions. The integral halyard simply will not do the job. Remember that roved three times will provide six strands of line and more than adequate strength.

While on the subject of the downhaul, In heavy air, one wants the jib set as low as possible and if one is using a fixed length pig tail possibly set to position the jib as high as possible to lessen fouling with the life lines, then the heeling force is greater in heavy air.

Using the down haul, the halyard can position the jib so that when it is downhauled hat band tight, the tack is very near the furler drum. Of course in light air, the height of the jib is of little concern so if wishing to raise it up to foul less on the life lines... no problem and easy to do.
Arlyn C-250 W/B #224

N/E Texas and Great Lakes
Arlyn's Sailing Site
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britinusa
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USA
5404 Posts
Response Posted - 04/12/2013 :  19:38:57  Show Profile  Visit britinusa's Homepage
Totally agree Arlyn.

On JD, I have a line from the Tack on the jib roved 3 times through the shackle on the top of the furler drum and the tack cringle. It makes it easy to bring the tack down.

But in reality, I have never adjusted the tack tension to cater to the varying wind conditions. If we are expecting light winds, I'll keep the tack cringle higher, but if expecting a bit of blow, then the tack will get tensioned down hard. But making changes mid sail is not something that comes to mind. Guess I'm not a racer!

Paul
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Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts
Response Posted - 04/13/2013 :  03:53:07  Show Profile  Visit Arlyn Stewart's Homepage
You are correct, it's not something one would change mid race... ya live with what is started with.
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Davy J
Master Marine Consultant

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USA
1511 Posts
Response Posted - 04/13/2013 :  04:23:39  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">he suggested using the halyard to position the sail and then using a 1/8" down haul line. Yeah, I know... how could that possibly be strong enough?<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
I re-tensioned my genoa last weekend. This method is exactly what the CDI manual says to do.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.