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 01-05-2011, 10:25 #1 Bomber Senior Member     Join Date: Mar 2010 Location: In my hammock! On the trail! Hammock: Hanging... Tarp: Up... Insulation: Down... Suspension: Tight at 30' View my gallery 8 Posts: 1,380 Images: 8 Rule of thumb for the differential cut?? How do you guys calculate the amount of "differential fabric" needed for the outer side of the underquilt? is there a rule of thumb, or do i have to resolve to using math at Grizz's level And for those of you who use darts - do you dart equally in both sides and respectively ends or let it be asymmetric? __________________ /Bomber.LTD Member of the infamous "Hyperborean Hang Gang" ] "I have not failed. I've just found 10,000 ways that won't work." -Thomas Edison"If there is anything bigger than my ego in here, i want it dragged outside and shot"!!! -Zap Brannigan To much time on your hands? Waste some time here Last edited by Bomber; 01-05-2011 at 10:57..
 01-05-2011, 13:44 #2 hikelite Senior Member     Join Date: Dec 2007 Location: Flagstaff, AZ Hammock: DIY 1.1 whipped ends Tarp: DIY 10'x12' Sil Suspension: Whoopie SLS Posts: 144 You got me thinking about this mathematically... At first it seemed like it might be complex. I started thinking about the geometry, without using any equations, and I think you can simplify things a bit. I'll try to explain verbally knowing full well that a picture will save me a thousand words We're discussing two curves. The one against the hammock and one spaced away from that curve the distance of your desired loft or baffle size. They aren't exactly semi-circles, but I think that approximation is close enough. I assumed we're going through 180 degrees, or a half circle. WI = Width of your inner piece of fabric WO = width of the outer piece of fabric B = the size of your baffles WO = WI + B*pi That's what I came up with at least. So if you know the size of the inner fabric and your baffle size, you can calculate the size of the outer fabric. Seems too simple, but I double checked my math. I think I solved it right. :P I'm sure the math whizzes will find a flaw in my logic. I can't get passed the feeling this is too simple :P Edit: if the math whizzes give my calculation their blessing, I'll use this when I make my own UQ! __________________ Life is hard? Compared to what? Last edited by hikelite; 01-05-2011 at 13:45.. Reason: addition
 01-05-2011, 14:05 #3 Syb     Join Date: Nov 2010 Location: Trenton, NJ Hammock: WBBB 1.1 DL/DIY Tarp: OES/WB Superfly Insulation: Incubator/Burrow Suspension: WB Straps View my gallery 41 Posts: 1,836 Images: 41 Whoa. Time to get my protractor out... Syb
 01-05-2011, 14:14 #4 Bomber Senior Member     Join Date: Mar 2010 Location: In my hammock! On the trail! Hammock: Hanging... Tarp: Up... Insulation: Down... Suspension: Tight at 30' View my gallery 8 Posts: 1,380 Images: 8 @hikelite Sounds plausible(though still a bit intimidating) @Syb +1 on that Whoa __________________ /Bomber.LTD Member of the infamous "Hyperborean Hang Gang" ] "I have not failed. I've just found 10,000 ways that won't work." -Thomas Edison"If there is anything bigger than my ego in here, i want it dragged outside and shot"!!! -Zap Brannigan To much time on your hands? Waste some time here
 01-05-2011, 14:33 #5 Dutch     Join Date: Apr 2007 Location: Reinholds, PA Hammock: Bridgeskin Tarp: DIY Blackcat Insulation: DIY Quilts Suspension: Whoopie sling View my gallery 194 Posts: 5,401 Images: 194 I generally use 7 inches on the outside and 6 on the inside. I flunked calculus though........twice. __________________ Peace Dutch GA>ME 2003 http://dutchwaregear.com Visit Dutchwaregear on facebook (and like it) 8th Annual Mt Rogers Winter Hang Spreadsheet
01-05-2011, 14:38   #6
Bomber
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Quote:
 Originally Posted by Dutch I generally use 7 inches on the outside and 6 on the inside. I flunked calculus though........twice.
Doesn't the distance between baffles vary dependent on the "thickness" of the baffles(or is it so small a difference that it's just an academic discussion)
__________________
/Bomber.LTD
Member of the infamous "Hyperborean Hang Gang"
]
"I have not failed. I've just found 10,000 ways that won't work."
-Thomas Edison
"If there is anything bigger than my ego in here, i want it dragged outside and shot"!!!
-Zap Brannigan

To much time on your hands? Waste some time here

01-05-2011, 14:45   #7
Dutch

Join Date: Apr 2007
Location: Reinholds, PA
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Quote:
 Originally Posted by Bomber Doesn't the distance between baffles vary dependent on the "thickness" of the baffles(or is it so small a difference that it's just an academic discussion)
I bet it could be caculated precisely, but it seemed to work for both summer and winter quilts for me.
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Peace Dutch
GA>ME 2003

http://dutchwaregear.com

Visit Dutchwaregear on facebook (and like it)

8th Annual Mt Rogers Winter Hang Spreadsheet

 01-05-2011, 14:53 #8 Bomber Senior Member     Join Date: Mar 2010 Location: In my hammock! On the trail! Hammock: Hanging... Tarp: Up... Insulation: Down... Suspension: Tight at 30' View my gallery 8 Posts: 1,380 Images: 8 Hey... as long as it works __________________ /Bomber.LTD Member of the infamous "Hyperborean Hang Gang" ] "I have not failed. I've just found 10,000 ways that won't work." -Thomas Edison"If there is anything bigger than my ego in here, i want it dragged outside and shot"!!! -Zap Brannigan To much time on your hands? Waste some time here
 01-05-2011, 15:37 #9 turnerminator     Join Date: Sep 2009 Location: Peterborough,UK Hammock: DIY Pertex Tarp: DIY with doors on Insulation: Down and synthetic Suspension: Whoopies & hooks Posts: 1,316 I followed Dutch's advice, but tweaked it. I used the 6"/7" rule and scaled it down to 4". Worked out at 100mm/117mm in proper units .
01-05-2011, 16:20   #10
Bomber
Senior Member

Join Date: Mar 2010
Location: In my hammock! On the trail!
Hammock: Hanging...
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Insulation: Down...
Suspension: Tight at 30'
View my gallery 8
Posts: 1,380
Images: 8
Quote:
 Originally Posted by turnerminator I followed Dutch's advice, but tweaked it. I used the 6"/7" rule and scaled it down to 4". Worked out at 100mm/117mm in proper units .
Do you mean spacing between baffles here
__________________
/Bomber.LTD
Member of the infamous "Hyperborean Hang Gang"
]
"I have not failed. I've just found 10,000 ways that won't work."
-Thomas Edison
"If there is anything bigger than my ego in here, i want it dragged outside and shot"!!!
-Zap Brannigan

To much time on your hands? Waste some time here

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