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  1. #1
    Senior Member Living the Highlife's Avatar
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    My take on a 3/4 differential underquilt

    Hello HF,

    I thought Id share my recent DIY 3/4ish differential cut underquilt. The dimensions are as follows...

    Length: 60
    Width: 42
    Baffle Height: 2 with a 2.5 maximum allowance
    Down Fill Power: 850 from wildernesslogics.com with 30% overstuff
    Shell fabric and baffle material: M50 and nanoseeum mesh from thru-hiker.com
    # of baffles: 10
    Weight: 15.5 oz. (with suspension and hardware)

    I first want to say thank you for all of the people who helped me through all the questions that I had regarding this project. Most specifically, Catsplat for the calculator, mad777 and demostiX for the channel ideas, and wwk10 for dart talks. I truly appreciate the family atmosphere here and the relaxed attitude everyone has to the multitude of questions I have.

    Construction and notes:
    First and foremost, I have to say that m50 is some of the most slippery stuff Ive ever had to work with on a thread injector. If I had to do it all over again, I would have gone with 1.1 oz ripstop to save me from pain and aggravation, as well as the cost per yard had me sweating that this project would not be screwed up. I initially started with measurements using a marker pencil, which also I plan to remedy as well, due to the pencil wearing off with excessive handling. If anyone has an idea of marking fabric with permanent white, please let me know. Sewing the baffle material on to M50 is not particularly hard, but the outer shell to inner shell is extremely stretchy and difficult to put together without having the seam have some slippage up and down along the edges. For the finishing of the edges and channels, I decided to go with a grosgrain ribbon but sewed it inside of the channel instead of putting it on the outside, to keep the channel tight and make the underquilt look nice and uniform. What can I say, Im a stickler for attention to detail. I recently took it out on a weekend trip, and put together a SCUM type suspension for it, utilizing 4 prussiks along the hammock ridgeline, using the outer prussiks for pulleys, and the inner ones for adjustment points. Finally, here are some pictures for everyone to gawk.


    One thing I was unsure of was the amount of loft that I would achieve with the overstuff I put into it. it seems like it just doesn't add up. so far, i've had it down to 40 degrees with no problem, but I'm anxious to see how it really holds up to the weather in the single digits. A matching top quilt is soon to follow, hopefully before the fall MAHHA in Gathland!!
    Corey Miller

    "Some ships are designed to sink others require our assistance."

  2. #2
    WV's Avatar
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    Congratulations! That's a worthy project. You said 30% overstuff, but you didn't give a weight of the down you used. I calculate the down I need on a project, fill the tubes, then eyeball it, and almost always add down until it "looks right", which means I probably overstuff 50%, but that's just me.

  3. #3
    MAD777's Avatar
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    Hey, that looks great!

    For marking, I use a metallic silver colored Sharpie. It shows up well and is durable. Most of my marks end up inside a hem, but I don't sweat it if they are visible in the final product as I'm shooting for function, not form.

    A trick I've learned for stretchy fabrics, is to make a mark every foot on both pieces. As I sew, I make sure that the marks stay lined up. My machine likes to pull the lower fabric through faster than the top, and these marks help me make adjustments.

    Enjoy that nice warm quilt this winter!
    Mike
    "Life is a Project!"

  4. #4
    Senior Member Living the Highlife's Avatar
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    thanks for the king words fellas!
    you didn't give a weight of the down you used
    I ended up going with 850 FP from wildernesslogics.
    and thanks mad for the advice on the fabric. I still have a matching top quilt to complete so I will post on that as soon as it's finished!
    Corey Miller

    "Some ships are designed to sink others require our assistance."

  5. #5
    Senior Member enoorange's Avatar
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    Most excellent! I am impressed!!
    TRIUMPH
    Go Your Own Way

  6. #6
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    Looking great! Love the color.

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