|Topic Review (Newest First)|
|11-25-2009 12:07 PM|
I think I see all the parts and placements now. I just came back from the boat. It is still on a mooring. I will locate the runners as far aft and outboard as I can to avoid a dodger. This will work well.
I have friends at Hinckley's and Morris Yacht so I should be able to get a look at a few installations. I like the pad eye in your photo, Wayne. That should make alignment easier for the backs.
Thanks again everyone. It was a great help.
|11-25-2009 09:58 AM|
Apparently the runners are used for sail shaping on the S-35. Basic Santana 35 Rig Tune
George - good luck on you project. You seem to be getting right down to "bare mettle" as firmware programmers used to say.
|11-25-2009 08:22 AM|
You guys have confused this bumpkin. I have what I thought were running backs on my Santana 35, and the tangs for their attachment are on the stern below the toe rail and outside the lifelines - as far back on the boat as you can go. They are still in the way when in use, so I have disabled them since I singlehand in light winds most of the time, but I also thought that their purpose was to better control the mast bend when racing.
|11-25-2009 05:46 AM|
Summer sailing along Maine's Eastern coast can be beautiful and is more often than not. I look forward to having another level of rig "comfort" for those marginal days. I also want to sail a bit further East with confidence.
|11-25-2009 05:35 AM|
All of this advice has been very helpful. Thank you.
Wayne, You are right, it would be a poor trade to compromise the whole point of having the rig to make having it more convenient.
I have one more concern, supporting the chainplate for the inner. I intend to fasten the inner headstay chainplate through the deck and to the thwart that supports the deck at that point. I have not exposed this thwart yet but expect it to be the same as the rest of the bulkheads. I intend to strengthen the thwart's bond bond to the underside of the deck and the hull with biax and epoxy and add to it if necessary. I am calling it a thwart because it does not continue down to the stem. Do I need to distribute this load that far? I can add knees and thickness to this thwart but a rod to the stem would be inconvenient.
|11-24-2009 06:49 PM|
On the C&C 35 i sail on there about at the wheel and main sheet traveler which allows the main trimmer to tend them during tacks
Synthetic line has worked very well
|11-24-2009 05:50 PM|
I would encourage you to position the tang for your runners as far aft as you can. I have never heard of a "symmetry" applicable to distance forward & aft of the mast in this regard.
The farther back you can position the tangs the more the load on the runners will be in countering the tendency of the mast to "pump" or ultimately bend. As you seem to know - the objective is to stop a buckling of the mast. The force vectors yield more and more to tension (up & down) as the runner attachment points move closer to the mast. You need to counter a force on the mast that will be largely longitudinal - fore & aft.
As far as annoyance, or inconvenience of using runners while tacking or gybing... yes, that is the nature of the beast. Letting the tangs reside forward certainly does open up the arc in which the boom can swing, but it also reduces the protection against a pumping mast - a poor trade.
ps as a Maine based sailor I defer to your better knowledge of Fundy. I do have to add that my one sail on it in the summer of '07 was a delight.
|11-24-2009 05:47 PM|
While they don't require a bulkhead they do require a solid attachment point. A knee glassed in under the deck would work. but I would see if there is already a bulkhead or some other solid point near the desired point of attachment. If so it might make sense to alter the location a bit and use something already available. If not you will have to create one. I would probably make it 10" or so deep and well glassed (with epoxy) to the hull to spread the load as much as possible. Try and align it with the angle of the runner. Use multiple layers of glass (biaxial is best) and make each successive layer bigger in area than the last.
|11-24-2009 05:13 PM|
That would suggest going with 12 degrees to keep them as far out of the way as possible. Do the chainplates for the runners require a bulkhead for their attachment. I assume they do and I can add whatever I need. I wonder how far down the hull that bulkhead needs to go?
|11-24-2009 05:05 PM|
That sounds workable. Remember that the farther aft the runners are the more they will be trying to counteract the inner forestay and the less they will be trying to compress the mast - of course this has to be balanced with ideally being able to beat to windward with one or both runners set while tacking and not having them interfere with the main.
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