# Thread: DIY Differential Cut UQ Calculator

1. Originally Posted by jordo_99
Finding this to be extremely helpful for my first attempt at a quilt...anything I should be doing differently since I'm looking to make a 72x72 flat quilt?

I could see some slight differences in the "Outer Shell Fabric Width per Baffle" and "Outer Shell Fabric Width" dimensions since it would be flat instead of arched.

...in other words, is this calculator designed to make a pre-curved UQ or is it just a flat UQ that takes the curved shape after it's attached to the hammock?

...I would imagine the former (flat quilt), but it looks like a fair bit of thought and effort have been put into it so I wanted to verify before I start putting together my order.
Sorry for not seeing you post until today! The calc is designed around the "flat" quilt you described, which then wraps around the hammock.

2. Ok, I may be nuking this out a little bit, but in the outer shell calculations, you take the baffle spacing times the number of baffles (that part I got), and then you took the height of the baffles times 2. Where does this extra measurement come into play? The outermost baffles? I'm currently marking out my outer shell right now and with the baffles marked, I'm at 48" total when the calculator says it should be 52"! Help!!

3. That last "baffle height times 2" is the outside walls of the quilt. All of this measurement is part of the outer layer as the inner layer has no walls. It snugs completely against the hammock bottom. If you look at a picture of a deployed underquilt, this will make sense.

4. Originally Posted by MAD777
That last "baffle height times 2" is the outside walls of the quilt. All of this measurement is part of the outer layer as the inner layer has no walls. It snugs completely against the hammock bottom. If you look at a picture of a deployed underquilt, this will make sense.
Yeah I understood what it meant as soon as I hit the enter button to send the message lol. Thanks though for the clarification.

5. Yeah, many a time I have answered my own question just by asking it.

6. Thanks to MAD777 for helping out! I 100% appreciate you guys asking questions - anything that's unclear to you indicates a need to explain things better in the next revision.

7. does it matter what kind of material I use for the baffle walls

8. Originally Posted by venturingscout
does it matter what kind of material I use for the baffle walls
For practical application, all u need is a breathable material that will keep the down inside it's channels. Nano-seeum or no-seeum mesh is a fav because it's easy to use, easy to find,light, and keeps the down contained.

Others have used silk and nylon to success

9. Thanks Cat! I used your calculator spreadsheet this week for my quilt. You made something that was complicated into something easy. Way to go!
Sarge

10. Anyone checked the Temp Rating calculation and know how 'accurate' it seems to be?

Just curious as I'm considering trying to build a light weight 20* UQ and I was hoping that this sheets calculations were likely, close enough to accurate to work.

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