Ultra Heavyweight Winter Down Quilt Set
I've aquired two down pillows with 39 oz. of 600+ fill down each (78 oz total) and am starting on design of an ultra heavyweight winter top and bottom quilt set for my hammock. Because this will be used only for winter camping only the overall weight of the final product is not as much of a concern, but I am wondering just how much of the down I should use. Thanks to the great calculators developed by forum members (Meteor and gt7599a quilt spreadsheets) I am able to calculate just about any weight quilts, but I don't really know how that will translate to warmth.
Has anyone had experience with either DIY or custom made down quilts targeting sub-zero temperatures? And how much down and and at what fill power have you used?
How much loft for sub-zero temps?
I can get a fairly good estimate of the loft required for various temps down to 0 degrees, based on the nice variety of quilts from the various cottage makers. However, I'm guessing there probably isn't a larget market for sub-zero quilts as I haven't seen any commercially availible.
I can calculate the amount of down required based on fill power, but I guess what I really need to know is how much loft will get me the a given temperature? E.g. What temperature range would a 5 inch or 6 inch loft achieve with a 15-20% overfill? :confused: Are there any commercially availible quilts with sub-zero ranges?
Calculator for temperature ranges?
Thank you for the information, that is helpful, and gets me in the right range. Has anyone made a calculator or chart that approximates temperature ranges for various loft heights? You indicated 4.5 inches of loft with the 10% overstuff might get to -10 or -15. Any experience with loft sizes over that?