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i'm planning on making a tarp with a cat cut over the ridge line..this, out of cuben. trying to visualize this has become a bit of a stumbling block! i can see that if it were made of streachy sil coated ripstop, the ridge line would just conform to the new shape by just tighten up the stake outs. but in the case of cuben, it's low streach properties shouldn't allow it to do this. and the cat shape has to be built into the ridge. my current plan is to have each side peice of cuben overlap the ridge by about 2-3inches and then bond each seam- this would provide a double layer at the ridge line where i suspect that wear could be an issue.. i said plan because if this two peice approch can't be done i might just make a one peice section that expands the tarp width by about 18inches..this peice would be of a heaver cuben. in either case the shape has to built in ( FWIW i plan on converting the current set up to a "over the tarp" support ridge line in early spring.) so how does one lay this out without compromising the tarps, finnished, ridge seam/line?
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ok, after two days, not a one reply. good thing that i've been looking around...found this and could be of intrest to others......LytW8.com home page i'll probably continue to look for more information on my cat cut cuben project, and on the same site i see more that i'd like to refer back to.
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Actually, almost any curve you cut into both pieces before they are sewn together will help. The only wrong thing you can do is to trace a very deep curve.
The larger problem with a cat cut on inflexible material is that it makes it harder to fold up the tarp.
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Thanks for the link to lytw8.com. There are some good DIY instructions on there.
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I've made alot of Silnylon Tarps with a 5" cat cut on the ridgeline, but not sure how it will work with Cuben. This Spring I am going to play with it. Sgt Rock has a Video on making these things and uses 3m with 1" overlap. looks like it works.
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yes smolehouse, the video was the prime motovation for my own project. his was a straight ridgline which makes things simple. i belive anyone can create a cat cut on a sheet of cuben...but it looks like a lot of work when glueing the two halfs together. to make sure the finished assembly is the same as the builders designed shape. i may just make a temp. form to help in that process and keep the mat'l over lap to 2" or less. i wonder if a heavyer weight fabric would help or hinder this part of construction? thanks rikall, i do like to be able to help...i only wish i could post a link rather that the site name.
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Here is an article with reference to a spread sheet.
http://www.backpackinglight.com/cgi-...ry_curves.html
