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Need MID advise
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Feb 13, 2012 at 9:57 am #1285619
Thinking about making a Hexamid. Basically just a 6 sided teepee.
Question is do I want to cat curve the sewn edges ??
And if so how much per foot. I have read 3/4 per foot but not sure
if that is correct.Feb 13, 2012 at 10:58 am #1838903silnylon?
4 sided pyramid – I use 2 inches deflection for 8 foot long diagonal
6 sided – I think you'de want 2 inches * 4 sides / 6 sides = about 1.5 inches deflection
Feb 13, 2012 at 11:45 am #18389201st one silnylon.
2nd probably cuben later on when I work out the bugs.
Feb 13, 2012 at 12:26 pm #1838944From my understanding of how things work, a cuben tent, mid, tarp, etc.., doesn't need cat cuts. The cat cuts are to help the stretchy, saggy (with moisture), silnylon stay taut, where cuben does not stretch and does not absorb any moisture.
BM
Feb 13, 2012 at 2:44 pm #1838993I'm making a cuben hexamid right now, and the ridge and all outer edges are cat cut. Many commercial cuben shelters have cat cut ridgelines or outer edges. It provides the same benefit for a cuben shelter that it does for a silnylon shelter. Cuben has low stretch, but it can still flap in the wind.
Feb 13, 2012 at 4:51 pm #1839049Maybe with Cuben you need fewer inches of deflection per foot of ridgeline?
But it's not that critical, you can have more or less?
Feb 14, 2012 at 7:09 pm #1839594I used a total deflection of 2" for all of the edges of my hexamid. I think anything more than 1" would work fine, and very large deflections (>3") are only a problem because they begin to reduce coverage.
Feb 14, 2012 at 7:26 pm #1839604Troy,
Lance Marshall's website has a great catenary curve calculator spreadsheet. It is the 3rd item in the menu on his homepage.
Enter the length of your seams in inches, pick your degree of severity and the spreadsheet gives you your calculated deflection at the midline.
I use Google Chrome and I had to click enable editing in the top center portion of the toolbar to get it to allow me to change the values.
I hope this helps.
Party On,
Newton
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