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Braided Biaxial fiberglass sleeving for mast tubes on CS 17


MattandTru

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For mast tubes I don't think it matters a lot how your glass was applied.  If in doubt, give it another wrap.  The added weight is minimal, especially considering where in the boat it is (low).  For a spar, where you want one thin and clear evenly wrapped layer is where those sleeves pay off.  That said, I see no reason not to use the sleeves other than cost, which doesn't seem all that much.

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There's no advantage to using biax over conventional cloth in the mast tube. The loads are borne on the step and at the deck partners. The tube just makes putting the stick in the hole easier. I used light cloth, to insure the inside of the tube was smooth(ish) and the mat was to help prevent the biax texture from printing through, into the finish cloth. I used biax simply because I have lots of scraps of this around the shop, so using it up on small projects is an economical thing. The mast tube can be an all cloth laminate if you desire. I didn't use tape, because of its thicker edges and what they create in a spiral wrap.

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Sounds like the answer is, "go ahead, or don't bother and use whatever you got."  

Thanks.  

I will try it on the spars.  

-Matt 

Using bidirectional glass sleeves on spars is a mistake.  It is good for hoop strength but is very poor for stiffening a spar.  The glass fibers need to be in line with the stress for either tension or compression strength.  If you doubt this, make a small sample and see for yourself.  Even carbon bidirectional sleeves don't add much stiffness in spars. 

 

As others said, it makes no difference for a mast tube but not for the mast itself.

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