Found a nice chart the other day but can't find it . Have loft of down and temp range. Anybody point my in the right direction ? Thx
Found a nice chart the other day but can't find it . Have loft of down and temp range. Anybody point my in the right direction ? Thx
I had asked this question not to long ago and I was informed by a gracious member that western mountaineering uses this formula to determine degrees fahrenheit:
67 - 18 x loft
(p.e.m.d.a.s.)
It seems fairly accurate and I have no clue how folks figure these things out. But thankfully they do
"In seed time learn, in harvest teach, in winter enjoy." -D'Signore's, Tide Mill Farm, Edmunds, Maine.
Thanks guys just what I was looking for shug . Waiting for the next report from sector 7 :-)
this might help too.
http://www.dream-hammock.com/DownFillCalculator.html
In order to calculate that, you need to figure out the volume of the chamber being filled, and the fill power of down being used.
Length x Width x Height / fill power
For example a chamber 50" long, 6" wide and a 2.5" baffle height with 550, 700 and 900 fill power:
50x6x2.5= 750 cu in
750 / 550 = 1.36 oz
750 / 700 = 1.07 oz
750 / 900 = .83 oz
You can also figure out an overstuff value by multiplying the oz by the % of overstuff desired. Using the 900 fill calculation from above and adding a 20% overstuff:
.83 oz x .2= .17 (rounded up from .166)
.83 oz + .17 oz = 1 oz per chamber.
There are a couple of fill calculators on HF that will do all the calculations for you if you enter the numbers into them - Catsplat and Meteor are 2 that come to mind. Great tools, especially when calculating radial/differential baffles.
And just to give proper credit, I believe Shugs chart originated from http://thru-hiker.com/projects/down_quilt.php
Last edited by HappyHiker; 05-02-2013 at 01:51.
Experience is the worst teacher - it presents the exam first and the lesson later. - Unknown
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