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Post by renegade27 on May 23, 2009 14:38:17 GMT
I'm the proud new owner of a 2006 - haven't taken delivery yet.
Can someone suggest the best approach for an adjustable backstay? Any photos from one of the performance models?
The angle is so wide I don't know if a bridle is best. Maybe to put a block up top of the "V" with a block and tackle to one side?
Looking forward to your suggestions!
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Post by offshore on May 28, 2009 1:33:41 GMT
Hi
We have a standard 36i that came with twin 5mm non adjustable backstays. We replaced this with a single 6.4mm wire finishing about 4m above the deck. Then we ran a bridle of 10mm spectra and a cascade with a 6:1 purchase of 6mm spectra on the end. This line terminates though a standard rope clutch. this gives a total purchase of 24:1. Similar systems with block specifications are shown on the ronstan and harken web sites. This works well but can only be adjusted from one side. Finishing the wire 4m up looks a little odd but allows enough angle for the bridle to clear the rear seats.
Barry
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Post by davideso37 on May 28, 2009 11:08:02 GMT
Hi Renegade, I have the SO37 and did not like the idea of a bridle as it would flex the fixed wire backstays and also change the angle where the stay go through the bimini. I went for a block at the top of the V and a two spectra cascades to a 6:1 block system on one side. That gives a 48:1 purchase and keeps the backstay angle constant. It has not been a problem being adjustable from one side only. Since the 35 and 37 have big genoas a powerful backstay is important. You can see the effect on the depth in our 135% genoa on our web site blog page www.3gwiz.com.au/passion/blog/ . One point to consider is the height of the top block on the 6:1 set. These are relatively heavy and will move around a lot in choppy conditions. I have kept ours so they line up with the bimini frame when loose and are low so that they are not around head height when tight. Regards David |
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Post by renegade27 on May 29, 2009 11:42:49 GMT
Thanks for the replies!
Offshore, how much did you end up cutting off the single backstay to make it 4 m off the deck? I'm interested in why you chose to change the length...
You both used Spectra rope for the inverted "V" portion of the adjuster. I took at look at the ronstan and harken websites and see all the blocks but no "rigging" rope - did you find this readily available? Is it as easy to cut and size as "normal" line? (quite a bit easier than working with stranded rigging wire!).
Davideso, great pics of the effect of backstay adjustment on jib shape. I couldn't imagine sailing without an adjustable backstay!
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Post by davideso37 on Jun 22, 2009 9:03:11 GMT
Renegade,
Just noticed a very good diagram of the adjustable back stay on the Jeanneau Sun Fast 37 Owners Manual on the Jeanneau web site. it's in French but the diagram is clear enough.
Regards
David
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Post by renegade27 on Jun 22, 2009 10:53:35 GMT
Great resource, thanks! I also saw a diagram on the SF35 manual but it showed anchor points on the boat that don't exist on my SO35. Between the two, I can get diameter of Vectran ropes and lengths - off through the catalogs!
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Post by MartyB on Jun 22, 2009 14:16:07 GMT
You might also try talking to a local rigger. They may have an option or way you have not thought of for installing an adjustable backstay. I have a screw style that only take 1-2" of movement to do change the shape of the jib. A hydraulic set up may be an option, altho pricey. Or a block style as you seem to be preferring. Check different manufactures web sites too, Harken has there compuspec, which will tell you what you need for over 2000 models of boats. I'm pretty sure the SO35 is in it. My older Arcadia was not up to about a year ago, then they updated the info from about 300-500 models, to what they have now.
Marty
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