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 01-08-2012, 03:55 #1 The Wolf in a Hammock Member     Join Date: Nov 2011 Location: Flint, Mi Hammock: Travel Hammock Tarp: ExpeditionExplorer Insulation: DIY IX TQ and UQ Suspension: SLS Posts: 65 Determining Warmth of Karo Step Top Quilts How do you determine warmth of Karo step quilts
 01-08-2012, 07:26 #2 MAD777     Join Date: May 2009 Location: South Florida Hammock: DIY, WBBB & Switchback Tarp: HG cuben,OES Spinn Insulation: DIY down 3/4 UQ/TQ Suspension: Dynaglide & Dutch View my gallery 39 Posts: 8,170 Images: 39 Warmth is derived from the average thickness of unconstricted down. In other words, don't worry about the hills & valleys in your finished quilt. Simply multiply the ounces of down by the fill power rating. Then multiply the length by the width of the quilt. Finally, divide the product of the ounces times FP by the product of the length times width. That will give you the average loft of that amount of unrestricted down. (oz of down x FP)/(length x width). I use Western Mountaineering's formula for determining what temperature that loft will give me. Temp = -18*Loft + 67 [Temp in F' & Loft in inches] Your actual thickness of the quilt will vary, no matter what baffling technique you use. But that isn't what determines the warmth. It's the amount & quality of the down spread over a quilt of a certain area. __________________ Mike "Life is a Project!"
 01-08-2012, 21:17 #3 DemostiX Senior Member     Join Date: Jan 2011 Location: Like Lewis & Clark: Wintrin' o/t Columbia again: PDX Hammock: Clark w 2QZQ mod,Tropical, NX;Nano Tarp: Clark micro Insulation: Major down Suspension: 7/64 SK75 +strap View my gallery 13 Posts: 2,516 Images: 13 Definition of loft Mike: That's a per layer estimating equation or rule of thumb, applicable with loft defined the way hmmckers look at their quilts: per layer. In the sleeping bag world, including WM's charts, loft is sometimes reported for two layers, top and bottom. __________________ right.you.are.if.you.think.you.are@gmail.com
 01-09-2012, 16:43 #4 The Wolf in a Hammock Member     Join Date: Nov 2011 Location: Flint, Mi Hammock: Travel Hammock Tarp: ExpeditionExplorer Insulation: DIY IX TQ and UQ Suspension: SLS Posts: 65 So how much would it differ from that, im sure the sleeping bag companies account for the insulation under you being compressed
 01-09-2012, 18:12 #5 MAD777     Join Date: May 2009 Location: South Florida Hammock: DIY, WBBB & Switchback Tarp: HG cuben,OES Spinn Insulation: DIY down 3/4 UQ/TQ Suspension: Dynaglide & Dutch View my gallery 39 Posts: 8,170 Images: 39 That's per layer. In other words, only the down on top of you is considered in that calculation. But your point is taken; of a sleeping bag has 6" of loft, that's 3" above you and 3" crushed below you. __________________ Mike "Life is a Project!"
 01-12-2012, 15:47 #6 DemostiX Senior Member     Join Date: Jan 2011 Location: Like Lewis & Clark: Wintrin' o/t Columbia again: PDX Hammock: Clark w 2QZQ mod,Tropical, NX;Nano Tarp: Clark micro Insulation: Major down Suspension: 7/64 SK75 +strap View my gallery 13 Posts: 2,516 Images: 13 Premium sleeping bag companies -- I am not including trading companies, merchandisers -- assume you will have a serious barrier to heat loss below you in the form of an insulating pad. Divide the SB loft from quality down in half; and every maker of quilts here is offering the same guidance as those quality bag makers, +-5F. __________________ right.you.are.if.you.think.you.are@gmail.com
 01-12-2012, 15:56 #7 lmoseley7     Join Date: Dec 2010 Location: Montgomery, AL Hammock: I only have the ones I've made Tarp: DIY Bumble Bee Insulation: DIY UQ, TQ Suspension: Whoopie slings View my gallery 21 Posts: 366 Images: 21 Check my math So 3" of loft would get you to 13 degrees? Temp = (-18(3)) + 67 Temp = (-54) + 67 Temp = 13
 01-12-2012, 20:42 #8 The Wolf in a Hammock Member     Join Date: Nov 2011 Location: Flint, Mi Hammock: Travel Hammock Tarp: ExpeditionExplorer Insulation: DIY IX TQ and UQ Suspension: SLS Posts: 65 according to this equation the burrow is good to 14* so its pretty close

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