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  1. #21
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    Where do you guys come up with all these numbers? I guess my music background doesn't lend toward thinking in numbers and logic. I'm one of those artsy types.

  2. #22
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    Quote Originally Posted by funbun View Post
    Will you be adding taper to the underquilt also?
    Yes, it is raining so I do not have a chance to measure right now. But when I attach my nest I have to tighten the drawstrings to make the quilt smaller in width to fit the hammock. This means there is extra width there.
    Is that too much to ask? Girls with frikkin' lasers on their heads?
    The hanger formly known as "hammock engineer".

  3. #23
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    Quote Originally Posted by Arkwater View Post
    I can't seem to make those numbers work in my design?!? What are your specs for your quilt design?
    Reworking them now, I think a miscalculated a little.
    Is that too much to ask? Girls with frikkin' lasers on their heads?
    The hanger formly known as "hammock engineer".

  4. #24
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    Ok, here is the reworked numbers

    for 2" loft with 15% overstuff
    Footbox width 40" savings 1.134oz
    Footbox width 36" savings 2.02oz
    Footbox width 30" savings 3.05oz
    Footbox width 26" savings 3.11oz


    for 3" loft with 15% overstuff
    Footbox width 40" savings 1.78oz
    Footbox width 36" savings 2.69oz
    Footbox width 30" savings 4.04oz
    Footbox width 26" savings 4.92oz


    Below is the math for the 40" footbox saving over the 48". Given as a rectangle since I am removing 2 triangles.

    shell weight saving per side= [(8in/1)(1yd/36in)*(36in/1)(1yd/36in)]*(1.05 oz/sq yd)=.23oz *(2 to account for each side)=.46

    fill weight saving= {[(2 in loft)*(8 in)*(36 in)]/(750 fill per oz)}* (1.15 to accound for overstuff)= .88 oz

    total saving for a 40" taper = 1.34oz


    Still a weight saving and something to consider.
    Is that too much to ask? Girls with frikkin' lasers on their heads?
    The hanger formly known as "hammock engineer".

  5. #25
    Senior Member NCPatrick's Avatar
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    Quote Originally Posted by hammock engineer View Post
    Yes, it is raining so I do not have a chance to measure right now. But when I attach my nest I have to tighten the drawstrings to make the quilt smaller in width to fit the hammock. This means there is extra width there.
    Yes, now you'll have to recalculate everything according to the "rain" factor. You'll have to include the additional rain/weight gain ratio... j/k

  6. #26
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    Quote Originally Posted by NCPatrick View Post
    Yes, now you'll have to recalculate everything according to the "rain" factor. You'll have to include the additional rain/weight gain ratio... j/k
    Don't forget the setting up in my mudd pit backyard factor. That has to be an exponental function.
    Is that too much to ask? Girls with frikkin' lasers on their heads?
    The hanger formly known as "hammock engineer".

  7. #27
    Senior Member blackbishop351's Avatar
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    Quote Originally Posted by Arkwater View Post
    The last quilt I made was 48" at both ends (3.25" loft). I calculated tapering the last 2' from 48" down to 40" for the footbox. By my calculations I would only save 15.6 grams (.55oz). I am glad I did not go to the trouble. When sinched up for a footbox it is snug around my size 11 feet. The high loft of the quilt takes up any open space around my feet.
    That weight savings seems a little small...did you account for the shell material you'd lose too? That's where most of the weight is for a down quilt anyway...
    "Physics is the only true science. All else is stamp collecting." - J. J. Thompson

  8. #28
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    Quote Originally Posted by blackbishop351 View Post
    That weight savings seems a little small...did you account for the shell material you'd lose too? That's where most of the weight is for a down quilt anyway...
    Actually figuring in 750 fill down and 1.05 oz per square yard material, the shell is half of the fill weight based on what I calculated. 1.1 DWR is probibly closer to 1.3, this might take it up to 75%.
    Is that too much to ask? Girls with frikkin' lasers on their heads?
    The hanger formly known as "hammock engineer".

  9. #29
    Senior Member Arkwater's Avatar
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    I was only tapering for the last 24", so it would not be much of a savings for me. I made a synthetic one that was tapered and did not like it. It limited the usage.

  10. #30
    Senior Member blackbishop351's Avatar
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    Quote Originally Posted by Arkwater View Post
    I was only tapering for the last 24", so it would not be much of a savings for me. I made a synthetic one that was tapered and did not like it. It limited the usage.
    Really? The prototype synthetic top quilt I made is pretty tapered...50" at the head, starts tapering about halfway, down to 30" at the foot. It's a convertible top/bottom quilt too, and it's worked really well both ways.
    "Physics is the only true science. All else is stamp collecting." - J. J. Thompson

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