Hello!
After making a winter UQ with traditional baffles, I want to try my hand at a summer quilt. Being in Sweden limits my availability to down, so I want to be able to use bulk packaging. This led me to the Karo Step method. I am going with full length, 4 cm height (loft) and am trying to figure out the differential cut, and I think I got it now.
I tried combining inches and centimeters, and for now I am going to explain it all in metric, if you want some conversions I can provide them.
Inner shell will be 122cm wide, with seam allowance (4 cm) included. I want to put in three darts of 4 cm each on the short sides. This will give me 102cm when I'm done.
Outer shell will be 142cm wide, 4 cm seam allowance, with four 6m darts, and two 4cm walls. This will also result in 102cm when I'm done. I know that 4cm is alot of seam allowance, but I had some problems with the winter quilt so I want to give myself some extra. This gives me 8 cm wider on the outer shell, to give me the differential.
I tried to figure out how to make the lengthwise darts, but I decided to skip it, I didn't have them in my winter quilt, and I use "Shug loops", meaning that I sew in a loop in the middle of the long sides to attach a shock cord which goes over the ridgeline and lends some support to the length.
I then plan on mapping out the Karo Step squares on the "darted" shells.
I drew out the two layers accounting for the darts at the ends, and then mapped the Karo Step squares. My problem is that with the differential in the width, I will need different dimensions for where I sew on the baffle walls onto the outer shell. How do I calculate that?! There must be some formula to give me a measurement for the walls that run head to foot, I can imagine that they are a centimeter or so wider in the outer shell.
If I just use the same measurements on the outer shell, won't that just give me more space on the sides of the quilt?
I read somewhere that Karo Step is not recommended for differential cut UQs, but I read chickenwings post, just couldn't seem to get this specific information out of it.
Going to be putting 150g of 860 down in it, according to the calculator (for traditional baffled quilts) should still be good down to 40F.
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