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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 05-25-2007
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Are you sure they are 'stoppers' and not just rollers to help the sail move during a tack? My last boat had the rollers, my new boat does not. I don't really notice a difference.

Mailspeed Marine Sail Chafe Protector - Pair - Only £10.95 - Mailspeed Marine Chandlery
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  #12  
Old 05-25-2007
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Quote:
Originally Posted by BarryL
Are you sure they are 'stoppers' and not just rollers to help the sail move during a tack? My last boat had the rollers, my new boat does not. I don't really notice a difference.

Mailspeed Marine Sail Chafe Protector - Pair - Only £10.95 - Mailspeed Marine Chandlery
Okay, that solves the other mystery: yes, there are rollers right above these stoppers. But they're both there...

-Dave
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Old 05-25-2007
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I wonder if the increased tension should go on the innerstays. This holds the mast basically erect. As force comes on the outerstays the spreader is forced in on the mast producing a bend to leeward. This has the effect of making the sail fuller in stronger winds just when you want the opposite.
If they are raked back to any extent they can push the mast forward at that point flattening the sail to some degree but how much depends on the exact position of the spreaders and rake. This may be small in comparison.
If your stoppers have an effect it may be to limit the tension achievable in the upper outer stays. To a degree this may allow the top to fall off depowering the main. However I suspect that you would want the tensions in top and bottom to be much the same to stop from bending the spreader. So I doubt they do much.
I had a problem with a former boat with some odd standard rigging for that class, namely no inner stay, save one running form the outer end of the spreader to the base of the mast.
In racing we always had trouble in heavy weather, until I finally worked out that the mast was bending the wrong way ie bending out in the middle to leeward.
I changed it to the rig you show with greater tension on the inners than the outers and it made a huge difference.
I guess to some extent it depends how stiff the mast is the spreader rake etc. I just worked on what I wanted the mast to do and figured it out rather than having any special knowledge.
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Old 05-25-2007
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Are you sure those aren't to keep the foresail from catching on the spreaders?

I seem to recall I've see something similar on smaller boats around here: little plastic discs with a slot and a center hole.
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Old 05-25-2007
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That's what I thought they were.... to help prevent chafe. I think the clamps are to prevent them from moving the spreaders down, which would be bad.
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Old 05-26-2007
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Rollers or no rollers, the key element to remember where spreaders are concerned is that the angle that the spreader makes with the upper and lower portions of the shroud must be equal. That is, the spreader must bisect the angle formed by the shroud as it passes over the spreader end.

Failure to observe this rule can lead to a heavily loaded spreader folding up or down against the mast, usually with loss of the rig.

Last edited by Goodnewsboy; 05-26-2007 at 01:01 PM.
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Old 05-26-2007
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The boat next to mine has those same devices, only they are directly under the spreader, rather than above. This leads me to believe that they are in fact rollers.
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Old 05-26-2007
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Quote:
Originally Posted by Goodnewsboy
Rollers or no rollers, the key element to remember where spreaders are concerned is that the angle that the spreader makes with the upper and lower portions of the shroud must be equal. That is, the spreader must bisect the angle formed by the shroud as it passes over the spreader end.

Failure to observe this rule can lead to a heavily loaded spreader folding up up or down against the mast, usually with loss of the rig.
Absolutely correct, but I suspect, a fact unrelated to the plastic rollers. I guess they are replacements or alternative to plastic "spreader boots" or whatever they are called...T-shaped bulbous things that snug over the spreader ends. Me, I just use electrical tape in red and green for the novice tailers.
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