Feb 22, 2012 at 2:52 am #1286014
I'm working on my first adventure into using down. I've bought the thru hiker kit and have read Roger Caffin's fabulous article. I'm a little confused over what is best for working out the baffle height. I'd like the overall loft to be 1.75 inches – so I was going to work out the weight of the down by using the length x width x height / fill power of the down and then add 10%. Question is, if I want an overall loft of 1.75 inches should I make my baffles this size or slightly smaller?
Thanks KirstyFeb 22, 2012 at 7:29 am #1842915
I like the way Joe @ Zpacks describes how they calculate both baffle and (over) fill loft:
900 Fill Power down means that one ounce of down should fill up to 900 cubic inches of space. Our 20 degree bag for example has a baffle height of 2.25", however it is filled with a calculated loft height of 2.925" (30% more than the baffle height) to account for any future loft loss. It will also have more than 2.25" loft between baffles. Our 30 degree bag has a baffle height of 1.5" but is filled with a calculated height of 1.95" (30% extra).
Tim @ Enlightened also has a nice chart showing all his size dimensions & (over) fill options:Feb 22, 2012 at 7:37 am #1842917
Brendan SwihartBPL Member
@brendansLocale: Fruita CO
I usually cut the baffles to to the baffle height I want. Using up .25 or so on each side shortens them enough to manage the down well (I also usually overstuff ~20-30% over the caculated need).Feb 22, 2012 at 7:43 am #1842920
Ivo VanmontfortBPL Member
The specs on enlightenedequiment can help you
I think that 1,25 inch is a safe height (it depends a bit on the distance between the baffles and the % overfill)
In my quilt , with a inch 1 baffle height, I measured 45 mm (about 1,75 inch) but in my case with a 100 percent overfill (400 gr down)
In my (flemisch) blog you can see a few photos how I made the baffles
edit: I used a differential cut for the baffles!!Feb 22, 2012 at 9:53 am #1842998
Jerry AdamsBPL Member
@retiredjerryLocale: Oregon and Washington
What about baffle width?
I have this idea that if, for example, your baffles are 2 inches loft, then the baffle width should be 2 or 3 X – 4 or 6 inches
If you're 1 inch loft, baffle width should be 2 or 3 inches
If you're wider, then thin spots will develop where there's no down
Does anyone have experience with this?Feb 22, 2012 at 11:45 am #1843054
Ivo VanmontfortBPL Member
my thoughts (For what it's worth.)
you must not economize on the down
overstuffing avoids this problem partially.
I copy from the manufacturersFeb 22, 2012 at 11:11 pm #1843369
Hi All – thanks for your help this is great. Ivo your quilt looks fantastic
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