Need MID advise
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Troy Ammons
(tammons) - F
Need MID advise on 02/13/2012 10:57:56 MST Print View

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.

jerry adams
(retiredjerry) - MLife

Locale: Oregon and Washington
Re: Need MID advise on 02/13/2012 11:58:33 MST Print View

silnylon?

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

Troy Ammons
(tammons) - F
Need MID advise on 02/13/2012 12:45:37 MST Print View

1st one silnylon.

2nd probably cuben later on when I work out the bugs.

Ultra Magnus
(Ultra_Magnus) - F
Re: Need MID advise on 02/13/2012 13:26:27 MST Print View

From 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

Colin Krusor
(ckrusor)

Locale: Northwest US
Hexamid on 02/13/2012 15:44:01 MST Print View

I'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.

jerry adams
(retiredjerry) - MLife

Locale: Oregon and Washington
Re: Hexamid on 02/13/2012 17:51:07 MST Print View

Maybe with Cuben you need fewer inches of deflection per foot of ridgeline?

But it's not that critical, you can have more or less?

Colin Krusor
(ckrusor)

Locale: Northwest US
Deflection on 02/14/2012 20:09:12 MST Print View

I 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.

John Donewar
(Newton) - MLife

Locale: Southeastern Louisiana
Re: Need MID advise on 02/14/2012 20:26:44 MST Print View

Troy,

Lance Marshall's website has a great catenary curve calculator spreadsheet. It is the 3rd item in the menu on his homepage.

http://www.wvi.com/~ulmyog/

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