Thank you for explaining, PharmGeek.
It is very interesting to see how different people's approaches are. I had IT help:
First I traced the dimensions of the original Wooki in Inkscape. Then I added an additional chamber, determined the area of each chamber (a feature to do this is available in the program) and calculated the area share in percentages of each chamber.
Attachment 157817
With regard to the total amount of down, I did it like you and took a look at on the data of Warbonnet (10 ounces in the 3-season Wooki). To find out how much more down I need because of the extra chamber, I just looked at how much larger the area of my wokie is compared to the original (+15%), so I chose 11.5 ounces of down. I then spread the down among the chambers according to the respective area proportions.
I have chosen the height of the chambers as usual for most commercial 3-season underquilts.
Maybe like this: Lie down in the hammock and let a second person pierce through the insulation to the skin (but not further
) with a very thin wire (<0.1 mm). Mark the penetration depth on the wire, then simply measure it.
The difficulty is to find a wire that is so thin that the fabric is not damaged. But should be possible.
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