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  1. #1
    New Member Golden Bear's Avatar
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    DIY Down underquilt questions

    whats up,

    I'm in the process of making a underquilt and wondering how many ounces of 850 down to put in it. I'm planning on making it full length (6'L x 28"W x 2"D). Any plans and suggestions would be great thanks.

  2. #2
    Senior Member WetRivrRat's Avatar
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    I don't have direct experience with down (just yet, that's last on my todo list - asthmatic family members.... ) - but here are some links that i've used as reference for myself:

    http://www.whiteblaze.net/forum/show...-for-a-32F-bag
    http://www.trailspace.com/forums/gea...ics/90935.html
    http://www.backpackinglight.com/cgi-...hread_id=57158

    This is a good idea - makes sense to me, I'll probably use the same technique -
    JohnSawyer: I used a shop-vac to harvest down from a comforter...
    Last edited by WetRivrRat; 08-03-2012 at 16:55.
    We all know of the original "Walk off the war" thru-hike - but, check out these guys, they're helping folks 'walk off the war' today -
    Donate to help fund gear for the warriors who are coming back home and need help walking off the war!
    WarriorHike.com

  3. #3
    Senior Member WetRivrRat's Avatar
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    Quote Originally Posted by socal hammock dude View Post
    {...} (6'L x 28"W x 2"D). Any plans and suggestions would be great thanks.
    These seem to be pretty big around here...
    Red River Gorge Quilt Instructions
    My DIY winter under quilt with instructions

    Good luck
    We all know of the original "Walk off the war" thru-hike - but, check out these guys, they're helping folks 'walk off the war' today -
    Donate to help fund gear for the warriors who are coming back home and need help walking off the war!
    WarriorHike.com

  4. #4
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    Temperature ratings are subjective, but I rely on this chart originally posted on HF.
    1.5" loft = 40 degrees
    2.0" loft = 30 degrees
    2.5" loft = 20 degrees

    For your dimensions 72" x 28" x 2" = 4,368 square inches
    Add 10-15% of overstuff = 5,000

    5,000 / 850FP = 5.75 - 6.0 oz of down
    Hard to believe, but less than 6 oz for 30degrees of comfort

    BTW 28" seems narrow, but A) I am not an expert and B) I think I overcompensate the other way too much.

    Calculates UQ differential http://www.hammockforums.net/forum/s...ad.php?t=53701

    Another UQ differential calculator https://docs.google.com/spreadsheet/...der=true&gid=0

    Down/chamber TQ https://docs.google.com/a/kingknob.c...der=true&gid=6

  5. #5
    MAD777's Avatar
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    May I suggest that you reconsider the width. I make my underquilts 40" wide which is more narrow than many. I've seen them 50" wide. I weigh 200# am happy with my 40" but I could never make 28" work for me.
    Mike
    "Life is a Project!"

  6. #6
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    SoCal,
    MAD777 is a minimalist (gram weenie).
    His suggestion to make it wider means even more than mine.

    Math is the same Width x Length x Heigh (See Catsplat spread sheet. Height of chamber is higher than height of baffle) divided by Fill Power = total weight of down neeeded.

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