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Rig Tension & Guages

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Rubato View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rubato Quote  Post ReplyReply Direct Link To This Post Posted: 14 April 2015 at 16:52
Originally posted by Clouded Pearl Clouded Pearl wrote:

Thanks. I played about with the backstay as the wind increased and I must say, it was noticeable how much better the rig felt and the boat handled. I am going to recheck the cap tensions, tweak them up to 19 to 20 and increase the Ds and see how we go. Overall however, having the lowers about 5% less than the caps seemed to give a mast bend similar to that recommended by Phil at Inspiration Marine and which also feels right. I'll post my findings.
 
The lowers should definitely be less than the caps. How much prebend does Inspiration suggest? I'm trying to remember what I've heard as the suggested amount. I believe it was in the 15cm range (6") maybe slightly more. This is with backstay totally off.
Steve

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rubato Quote  Post ReplyReply Direct Link To This Post Posted: 14 April 2015 at 16:59
Originally posted by Mark&Catherine Mark&Catherine wrote:

I have increased my CAPS again to 20 when we changed from going South to going North in the Red Sea in prevailing wind of Northerlies and 20 Knots average.  Even with this I get a significant forestay sag.  Im using the FCL self tacker at the moment as we are cruising.  

Does anyone have a view on how much sag you should get in say 15 knots close hauled, and how you would go about checking it.  Im inclined to tighten my forestay a little unless someone can come up with a method of checking.
Mark
 
Mark
You can check it by taking a spinnaker halyard forward and attaching it to the bottom of the forestay and then tensioning it. This makes it easier to estimate the sag but seeing the gap between the halyard and the forestay under sailing conditions.
 
As to what you'll see - on a Hanse, likely 10-12 inches. On other boats, with a different rig configuration where forestay sag is easier to control, the target is usually 4-6. But as I mentioned earlier, it does depend on the cut of the sail - what the sailmaker assumed the sag would be.
 
You mentioned you might tighten your forestay a little - how do you intend on doing that? There is an optimal length for the forestay which provides a certain amount of mast rake. Once that is set, the forestay tension should be adjusted with cap shroud tension. If you shorten the forestay, which may tighten it but will also move it forward, the reduced mast rake will actually hurt the pointing ability of the boat.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark&Catherine Quote  Post ReplyReply Direct Link To This Post Posted: 15 April 2015 at 12:27
Hi Steve, the  adjustment is made on the bottle screw inside the furling drum.  I suppose what i'm saying is that my mast rake might already be too high, it looks more raked than it did.  Useful information about the 10-12 inches though, ill have a look at that.  


385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Clouded Pearl Quote  Post ReplyReply Direct Link To This Post Posted: 15 April 2015 at 13:59
Hi. Inspiration Marine suggested taking the main halyard to the gooseneck and measuring the point furthest from the mast to the tensioned halyard. They suggested 8cm is a good target which will equate to sufficient mast bend. I suppose this will also be dictated by the cut of the sail.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Clouded Pearl Quote  Post ReplyReply Direct Link To This Post Posted: 30 May 2015 at 21:02
We've just reset our rig tension to 24% caps and 15% lowers. This brings tge settings to what IM suggested. We found the boat sailed well with only 15% caps but I understand this is a little too loose for a fractional rig so we've taken it to the maximum now. We'll report our findings.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Clouded Pearl Quote  Post ReplyReply Direct Link To This Post Posted: 06 September 2015 at 22:44
Now I've had time to test the settings in various conditions, my thoughts are that at 24%caps and 15% lowers, the main is a little too flat and I'm getting a little more weather helm than before. I'm going to ease the caps to 20% and this should reduce the rake. Hopefully this will be a good final compromise.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rubato Quote  Post ReplyReply Direct Link To This Post Posted: 08 September 2015 at 17:43
Easing caps will not reduce rake CP. It will reduce prebend definitely giving you a fuller main but will also reduce forestay tension which will reduce pointing ability. You need to reduce forestay length to reduce rake. If you'd just like more power in the main (less flat), you could actually tighten the lowers.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 08 September 2015 at 18:53
I had my forestay shortened to move mast tip 300-400 mm forward. Mast is now dead upright. ( as sighted against the corner of a building at right angles to the boat)
Boat sails better to windward now with less weight on the helm. I have circa 50mm pre bend but keep lowers a bit slacker to allow backstay tension to put more bend in when required. 24% in caps, 18% mids about 14% lowers ( but on my boat lowers are thicker so that distorts the % reading applied)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Clouded Pearl Quote  Post ReplyReply Direct Link To This Post Posted: 08 September 2015 at 21:02
Hmm. I think I need to read up a bit more. Thanks for the heads up.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark&Catherine Quote  Post ReplyReply Direct Link To This Post Posted: 30 September 2015 at 05:30
Does anyone else have a % setting for the D2s ( or mids) between upper and lower shrouds? We have resettled our mast and will set 20% caps and 15 lowers (D1s) which is what we had before, but we have never before altered the factory settings for the D2s
385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine
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