There are different types of down available. 750 fill grey goose down was used for this quilt. The fill power is how many cubic inches of volume 1 ounce of power will fill. This means that for this quilt 1 ounce will fill 750 cubic inches. The total amount of down is calculated by
Volume of Quilt = (Length in inches) x (Width in inches) x (loft in inches)
Total Down Used = [(Volume of Quilt) / (Down Fill Power)] x (Percentage of Overstuff)
This quilt was made to get a total loft of 2.5”. The baffles are made to be 2” tall. The extra half inch of loft comes from the over stuff. For this quilt I overstuffed each baffle by 15%. That means the equation above comes to:
Volume of Quilt = (78”) x (48”) x (2”) = 7488 cubic inches
Total Down Used = [ 7488 / 750 ] x (.15) = 15 oz
I chose an equal spacing on the baffles. I made 10 baffled compartments every 7.8”. This means that the quilt needs to have 9 baffles. The following equation is used to determine the amount of material needed for the baffles.
Total baffle length = (Number of baffles)*[baffle height + 1.5”]
The factor of 1.5” was used to account for the roll seam that is used to sew the baffle to the shell material. This will be explained more in detail later.
Total baffle length = (9)*[2” + 1.5”] = 31.5 inches
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