arrrrrg! Well...I kinda spit balled it more or less..but had a certain methodology in mind to start with.
1st - I recalled in my mind reading that Brandon uses 10 oz of down in the 3 season wooki....so 10oz divided by 9 baffles = about 1.1 oz per baffle. So I mean, that I saw as a point of reference or starting point or "benchmark" if you will...
2nd - I have no earthly idea how to calculate the volume of each chamber...doing the "catsplat" type spreadsheet to include the geometry and volume of standard baffle including that is weird enough, but introducing a odd sorta shape like these are....I just am not sure how to do that math frankly...there is likely easy calculations for such a shaped cube where in you enter several dimensions and out pops the number, but combining that math with the stuff we see with catsplat and all iterations since....no clue.
SO....
3rd....I calculated the volume of the longest baffle using rough "middle" baffle width value...and a vaguely estimated height of the baffle...my baffles at their lowest point would be 3 inches where they attach...and at their highest I just was not sure...so I split the difference. My math as I recall looked like this: 4 inches wide times 4 inches tall times 78 inches long (I think that was my longest baffle as I recall) = 1,238(volume)...divide that by fill power (850) = 1.46 oz's - I multiplied that by 1.15 (adding 15%) just as another fudge factor so that is 1.68....the other baffles that vary in length, I merely took the percentage difference in length and reduced the volume according to that change in length.
4th - I used many magic clips after stuffing and fluffed up the down as best I could - let it set a couple hours...examined how full each baffle looked...a couple looked a tad anemic...I stuffed those each with an extra quarter oz...and then sewed it up.
Seems to worked out ok so far...I think I overdid it, but im ok with that...it fluffs up at least to 3 inches minimum as I measure loft...but upwards of 4.5 inchces depending on how I shift the down around...I think my head in max loft is more than other areas. That is measuring the loft while laying flat on ground.
Once I hang it...the loft appears to be unaffected, but I find it hard to measure loft while it is hung (ideas??)...
btw...when I cut my outer shell...I did so in a way that if at width point X on the quilted area where you sew it down...if it is 42 inches wide lets say...I added not only the differential width to the outer shell, but the baffle height to account for verticle travel of the fabric at both sides...so as I recall, my width differential was added 6 inches...and the loft was perhaps estimated at 3.5 inches...so I distributed 6 inches added baffle width between each of the baffles...but also added 3 inches at each side of the fabric to account for verticle "wall" travel.....coincidentally, those side baffles are the ones that looked a tad anemic upon first attempt stuffing them...
Keep in mind...I am spit balling here...I have no earthly clue, lol....
Im actually quite happy with this build....
One thing I will do different next time is PLANNING EXACTLY where I put the pleats...both those pleats in the baffle material coordinated with where I pleat the outer shell material....I kinda "winged" it, and just put down but concentrated some at the feet where there is a marked bend from flat to nearly straight up...and was sure to put pleats at where the butt is and a bit at the head...as I placed them, I would intermittently check how much excess I have at the end stretching it all out while still in the machine to keep track...if that makes sense.
Next time, as I draw out all my marks for baffle placement...I will as well, mark where exactly I plan to put or concentrate any and all pleats
Bookmarks