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Post by edanalong on Jul 3, 2008 11:21:30 GMT
The mast pumping was looked at by a friend, who is a sailmaker as well, and said that it was way beyond what I should feel comfortable with. He suggested a baby stay. Has any one added an inner foresstay to their SO? I have a radar mounted between the 1st and 2nd spreaders and it seems like there is a fitting up on the mast to handle it way above the radar. I would love to hear about how someone else solved this issue or how you installed an inner forestay.
Fair Winds
E
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Post by Geoff on Jul 3, 2008 13:46:46 GMT
E
What size SO do you have???
G.
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Post by MartyB on Jul 3, 2008 14:02:46 GMT
I am going to swag based on this post that they have an SO40! Personally I do not know what mast pumping is. But based on the first post, I would concur that some rig tuning is in order. If it is literally a mast moving side to side with gusts, that can be eliminated by tightening the side shrouds, or if a for aft issue, tightening the forestay if it is not a roller furling setup, or tightening the backstay which would be the more common way to mke sure the fore and aft stay are tight. A Loose guage is the most common tool here in NAmerica for getting the shroud/stay tension correct, about 20-25% of breaking strength of wire, not sure how to figure rod or equal material. Marty |
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Post by Don Reaves on Jul 3, 2008 21:35:55 GMT
Typically, mast pumping is fore and aft in the middle of the mast. Tightening either the forestay or the backstay doesn't work for a masthead rig, because you need to keep the middle of the mast from moving, not the top.
This is certainly not a SO35, since they have a baby stay as delivered from the factory.
Don
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Post by edanalong on Jul 3, 2008 21:51:42 GMT
How'd you guess. Its a SO40. Its this a common problem with the 40 footer?
I've got her an appt. with the only master rigger in town Tuesday morning. The lowers are pretty tight, and I've haven't tested the intermediates, the backstay is also tight.
It pumps between the 1st and 2nd spreaders fore and aft. We were crashing through some nasty chop last week when I discovered it, it looked like it was moving a good bit more than a foot possibly more. I've tried it under power and with the sails up, seems pretty bad either way. The top of the mast dosn't look like it moves much at all just the midsection.
Any ideas?
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Post by MartyB on Jul 4, 2008 17:00:56 GMT
"I am going to swag based on this post that they have an SO40!" The "this" in above post, sentence referred to a previous post with a question regarding your SO40. If you do not have a mini stay, that might help, they have them that can be removable when running down wind, along with adjustable like back stay.
Marty
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Post by Jeff Motley on Jul 7, 2008 5:57:34 GMT
Good advice with the baby stay. Another option is to add check stays or runners, but this is more race boat oriented and would be too much of a pain on a cruiser.
If you are going to install a baby stay I would recommend that you also install a small track with an adjustable car that would let you tension the stay based on the wind/sea conditions. C&C did this with allot of their boats. As Marty suggests, make sure that you can secure the stay to the track or deck with a snap shackle as this allows for a quick and easy disconnect when not required.
Jeff
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