foolishforchrist Posted August 11, 2015 Share Posted August 11, 2015 I'm a newbie when it comes to working with fiberglass so forgive me if I'm asking a duplicate question. I did check around on google and didn't find the answer. The Mark IV reads on chapter 3 page 3: "When joining UND across the major fibers, it is lapped 1" per ply, but when joining UND along the major fibers, it is butted next to the piece it is joining." Could someone please elaborate on what they mean by "across" and "along"? See the attached png for my understanding of the text. Quote Link to comment Share on other sites More sharing options...
Marc Zeitlin Posted August 11, 2015 Share Posted August 11, 2015 Could someone please elaborate on what they mean by "across" and "along"? See the attached png for my understanding of the text. Your first image is correct - if the UNI needs to be "wider", you butt the fibers. The second image is a misunderstanding. The plans are referring to making the fibers LONGER, not crossing. So if you need to lengthen the fibers, you take the red image in your first pic and overlap the top 1" onto the bottom 1" of the black image. That will allow the fibers to transfer the load. 1 Quote Marc J. Zeitlin Burnside Aerospace marc_zeitlin@alum.mit.edu www.cozybuilders.org copyright © 2024 Link to comment Share on other sites More sharing options...
Kent Ashton Posted August 11, 2015 Share Posted August 11, 2015 Bill, What are you building? I am in Concord, not far down the road. I can't recall any place in the plans where the end of a length of UNI is joined to the end of another length of UNI. In lots of places UNI is laid-up side-by-side to cover a wide area or on top of other UNI as in a spar-cap buildup. Quote -KentCozy IV N13AM-750 hrs, Long-EZ-85 hrs and sold Link to comment Share on other sites More sharing options...
foolishforchrist Posted August 11, 2015 Author Share Posted August 11, 2015 Your first image is correct - if the UNI needs to be "wider", you butt the fibers. The second image is a misunderstanding. The plans are referring to making the fibers LONGER, not crossing. So if you need to lengthen the fibers, you take the red image in your first pic and overlap the top 1" onto the bottom 1" of the black image. That will allow the fibers to transfer the load. Awesome thanks for the quick reply Marc. Quote Link to comment Share on other sites More sharing options...
foolishforchrist Posted August 11, 2015 Author Share Posted August 11, 2015 Bill, What are you building? I am in Concord, not far down the road. I can't recall any place in the plans where the end of a length of UNI is joined to the end of another length of UNI. In lots of places UNI is laid-up side-by-side to cover a wide area or on top of other UNI as in a spar-cap buildup. I'm building a Cozy mark iv. Quote Link to comment Share on other sites More sharing options...
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