off center mast, advice needed.

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off center mast, advice needed.

Postby Elad » Tue Aug 19, 2014 5:00 pm

Hey All,

I enjoy the summer vacation, sailing with Grand Illusion in the Greek Islands.

I'll share some thought and doubts soon but the in the meanwhile I need an advice.

Sailing, I heard a creaking noise from the mast area and after close look a friend of mine realized that the mast is chafing with the mast base(photo attached)

I tried to loosen the shrouds, "re-position" and tighten them back but it seems that after sailing the problem persists...

Any advice...?

Thanking you in advance

Elad

mast.jpg
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Re: off center mast, advice needed.

Postby Antti_DD » Tue Aug 19, 2014 8:55 pm

Hi Elad,

This is a very interesting topic since I had almost identical problem this summer. While sailing I could hear creaking noise coming from the mast/inside the boat. It took me many days to locate the sound source to the mast base as, similar to your case, the mast was chafing with the mast base. However, I could not see any wear in the mast base. After adding some CRC the sound disappeared. I haven't had this problem earlier, so I guess that when stepping the mast in the spring, the mast was a bit off centered which created this tension in the mast base, as the mast cannot turn freely. I don't actually know if the mast should be able to turn while sailing, but as we see from Elad's photo there is some room for movement in the mast base. I haven't really examined how the mast behaves when for example tacking the boat in heavy wind.

I am afraid that if loosening the shrouds won't help, you might have to visit the mast crane for repositioning the mast. It would be interesting to hear, if someone else has experience on similar case.
Antti Laine, Forum Administrator
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Re: off center mast, advice needed.

Postby Elad » Thu Aug 21, 2014 4:49 pm

Well....I did what I could for now, loosen the shrouds, inserted a piece of rubber to prevent the chafing and will seek some help at the next harbour, probably Kos, I still hope I wouldn't have to use a crane.

Here at the Med we don't winterize the boats and the last time the mast was stepped was probably 2 years ago after I replaced the shrouds and renovated the mast.It was done by the shipyard and maybe they misplaced it??

Will keep you updated.

Attached photo with the rubber to prevent the chafe.
Attachments
mast1.jpg
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Re: off center mast, advice needed.

Postby Elad » Tue Feb 24, 2015 10:17 am

Hey all,

Since my last post regarding this topic I tried to better fix this problem and few month ago I put 2 plastic spacers instead of the rubber inside the gap between the mast and the mast's base. I believe that this fixed the problem of lateral movement of the mast but I still have sporadically, a problem of pitching, it seems that sometimes, especially when the boat goes up and down on a wave the mast itself slightly pitch on the mast base,I'm not sure if tensioning the backstay and shrouds would fix this problem and I was thinking to install instead of the plastic spacers that I put an "omega" shape plastic that will also limit the pitching movement of the mast.

Before I do so I want to make sure that my mast is well positioned so I attach 2 photos, if someone could compare it to the position of his mast on top of the mast's base I will appreciate it.

Another thought that I have regarding this matter is how the mast base is connected to the superstructure of the boat??
I took the headliner and saw no nuts....does someone know where the screws of the mast base go to? are there nuts inside the fiberglass?

Best regards,

Elad

1.jpg
1.jpg (139.34 KiB) Viewed 1596 times

2.jpg
2.jpg (112.65 KiB) Viewed 1596 times

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Re: off center mast, advice needed.

Postby Antti_DD » Thu Feb 26, 2015 9:13 pm

Hi Elad,

We always unstep the mast for the winter so positioning the mast in the spring is always a bit troublesome as the mast base is kind of floating and doesn't have a locking pin etc. Unfortunately, I could not find a good photo of our mast base (with a mast on) and the mast is unstepped at the moment. However, based on my memory, your positioning looks pretty similar to ours.

DD's mast base was removed and re-sealed two years ago. I believe that the nuts are inside the fiberglass as the bolts could be loosened and tightened from the top without access to the nuts. The reason for this mast step project was, that when I bought the boat, I discovered some hairline cracks radiating from the aft mast step bolts. I wanted to make sure, that the core material is dry under the mast step to prevent future problems so we drilled a test hole. Fortunately the plywood was bone dry so there was no need for a larger renovation.

mast step2.jpg
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mast step1.jpg
mast step1.jpg (34.84 KiB) Viewed 1578 times


plywood core.jpg
Test sample
plywood core.jpg (41.58 KiB) Viewed 1578 times
Antti Laine, Forum Administrator
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Re: off center mast, advice needed.

Postby Tentation » Tue Mar 03, 2015 7:01 pm

Hi Elad,
this afternoon I went to the boat and shooted these pics:
mast base 5.jpg
mast base 5.jpg (293.55 KiB) Viewed 1543 times

Mast base 1.JPG
Mast base 1.JPG (243.31 KiB) Viewed 1543 times

mast base 2.jpg
mast base 2.jpg (230.23 KiB) Viewed 1543 times

mast base 3.jpg
There is an hairline crack starting beneath the aft R/H screw
mast base 3.jpg (243.59 KiB) Viewed 1543 times

mast base 4.jpg
mast base 4.jpg (305.28 KiB) Viewed 1543 times


To me there is no difference with regards to your mast installation.
Last summer, on our way back from Spain to France in heavy sea and wind, I noted a noise coming from the mast area. I guess it was the same noise you noted also.
Each winter when the boat is in the boatyard I release some tension from the shrouds, but last year when returning to the water I have not screwed the turnbuckles as much than usual ( friends were saying that there was to much tension so...... :oops: )
Now I think that was the reason for the appearance of the noise.
Next month Tentation would be back on the water with a rigging well tensionned, Hmmm...
hope this can be usefull to you
Robert

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Re: off center mast, advice needed.

Postby Antti_DD » Sun Mar 26, 2017 7:47 pm

Hi everyone,

I bring this old topic up, because this is again a timely subject as I am going to step the mast in a few weeks time. I have continued to have occasional problems with creaking noise coming from the mast step. This noise appears only in about +20 kts downwind sailing. On the other hand, when beating to windward even in strong winds, the mast base is totally silent, although the pressure on the mast step is probably highest then. I agree with the other members, that the source of this is sound is probably chafe.

Thanks Elad for the photo! I am planning to try a similar solution this year. Has anyone else had this similar problem and how you dealt with it?
Antti Laine, Forum Administrator
HR 29 # 483 "Dolphin Dance"
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