MattandTru Posted July 6, 2015 Report Share Posted July 6, 2015 http://www.duckworksbbs.com/supplies/cloth/sleeving/index.htm Has anyone used this stuff to make the mast tubes for the CS 17 masts? It is fiberglass cloth woven in tubes of various diameters and weights. Just saw it as I was shopping for some supplies and thought it might do a slick job of it. -Matt Quote Link to comment Share on other sites More sharing options...
Hirilonde Posted July 6, 2015 Report Share Posted July 6, 2015 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. Quote Link to comment Share on other sites More sharing options...
Jknight611 Posted July 6, 2015 Report Share Posted July 6, 2015 I just used some 3 inch tape scraps, you know the little 6-8 inch pieces that seem to accumulate. I think it is simply a guide when you insert the mizzen mast. Mine was about 4 inches too long, I was amazed how strong that cut off was. Quote Link to comment Share on other sites More sharing options...
PAR Posted July 7, 2015 Report Share Posted July 7, 2015 My CS-17 mast tube was done with an initial layer of 6 ounce cloth and a layer of 2 ounce mat behind it. Once it had gelled, I diagonally wrapped 12 ounce biax a number of times. The initial cloth and mat was to insure a reasonably smooth inside surface and help tie the biax to it. Quote Link to comment Share on other sites More sharing options...
MattandTru Posted July 8, 2015 Author Report Share Posted July 8, 2015 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 Quote Link to comment Share on other sites More sharing options...
PAR Posted July 9, 2015 Report Share Posted July 9, 2015 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. Quote Link to comment Share on other sites More sharing options...
Tom Lathrop Posted July 10, 2015 Report Share Posted July 10, 2015 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. Quote Link to comment Share on other sites More sharing options...
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