How to make attachments to carbon fiber mast. - SailNet Community
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post #1 of 15 Old 01-01-2016 Thread Starter
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How to make attachments to carbon fiber mast.

The reason for asking is, the previous owner has an attachment for a whisker pole strapped to the mast with large zip ties, workable but ugly…. It doesn’t appear that anyone has ever attached anything to the mast with screws since it left the builder, so I hesitate to be the first to try… My thought was an adhesive of some kind, 3M 5200 maybe. Adhesive should be at least as strong as zip ties. Are there drawbacks I’m not seeing? Could the adhesive have any adverse affect on the CF? All input is appreciated……..
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post #2 of 15 Old 01-01-2016
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Spar makers typically us Loctite blue on the threads and a bit of Tefgell under the DS machine screw head.
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post #3 of 15 Old 01-01-2016
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Re: How to make attachments to carbon fiber mast.

I don't know Carbon, but it has to be an approved system by the spar or Boat manufacturer I'm quite sure.
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post #4 of 15 Old 01-01-2016
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Re: How to make attachments to carbon fiber mast.

Plenty of double-sided adhesive tapes will do what you need, strong, no mess, no damage.

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post #5 of 15 Old 01-01-2016
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Re: How to make attachments to carbon fiber mast.

I just recently heard about 3M VHB tape. Videos are impressive, but I would first talk to someone who knows carbon fiber. I have thought about stuff like this, but I really don't want to make any structural changes to my mast. I heard recently of a CF mast that broke from a knockdown and the spinnaker halyard had been run to the masthead though Freedom masts were originally built to be fractional. Not sure if that was the direct cause, but I am not taking any chances, if there are other options available. For example, you might also want to take a look at Garhauer. They make a rigid vang with a clamp-on base for the Freedom masts. I'm sure they could do something similar for the whisker pole attachment.
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post #6 of 15 Old 01-01-2016
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Re: How to make attachments to carbon fiber mast.

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Originally Posted by gamayun View Post
...For example, you might also want to take a look at Garhauer. They make a rigid vang with a clamp-on base for the Freedom masts. I'm sure they could do something similar for the whisker pole attachment.
Don't assume a clamp-on fitting is less damaging in terms of introduced stress. I believe just the opposite is true in this case.

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post #7 of 15 Old 01-02-2016
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Re: How to make attachments to carbon fiber mast.

VHB is likely overkill, it just needs to hold a bracket with a few lbs of whisker pole. 5200 is waay overkill, you really don't want to use that stuff.

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post #8 of 15 Old 01-02-2016
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Re: How to make attachments to carbon fiber mast.

After reading some comments on point loading on Carbon on Bob's CC thread I wouldn't do anything without some pretty specific advice, I'm assuming this is a Carbon unstayed spar with only mast-head attachments. Fore and aft stays and halyards. Correct?
We are in the Freedom forum, which Boat??
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post #9 of 15 Old 01-02-2016
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As a bonafide, my advice came from the production manager at a spar maker. It's the same spar maker Bob is using for his for carbon cutters. Carbon fiber can be drilled and tapped provided there is enough thickness. SS and carbon can live together without corrosion, aluminum not so much.
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post #10 of 15 Old 01-02-2016
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Re: How to make attachments to carbon fiber mast.

Quote:
Originally Posted by pdqaltair View Post
Don't assume a clamp-on fitting is less damaging in terms of introduced stress. I believe just the opposite is true in this case.
Yes, agree; this still creates some anxiety for me, but the vang clamp sits at the largest area of the mast, and I was advised to not bolt it down too tightly. Rubber material between the metal and CF also makes it "grippier." The truly bad force that I envision would be an accidental jibe in super high winds/sea state with or without a preventer. And then, it is probably more likely that the boom or gooseneck would give out first before the base of the mast does. I certainly would be interested to hear from those who know about CF spars what they think about this reasoning.

Last edited by gamayun; 01-02-2016 at 05:52 PM.
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