# Thread: DIY Down underquilt questions

1. ## 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. 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...

3. Originally Posted by socal hammock dude
{...} (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

4. 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. 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.

6. 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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