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  1. #41
    Senior Member BillyBob58's Avatar
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    Quote Originally Posted by MacEntyre View Post
    That's a good approach, I'm sure. On cold hangs last winter I used highly breathable fabrics, for the same reason: to keep condensation out of the down. I was amazed at how well it worked. So, I've become an insulation schizophrenic, alternately using non-breathable and breathable layers. What got my attention was the realization that there is a huge humidity differential between my skin at 85*F and the outside at -15*F. I think some of us don't make much condensation, or it goes up or out or somewhere, while others find a puddle of water in the morning.

    - MacEntyre, up at 0430, tough to stay on-topic
    Quote Originally Posted by JerryW View Post
    I think that is the key statement right there! Some folks can get away with using a non-breathable inner layer and others can't. Individual experimentation needed.

    Everyone is different, just like being a cold or warm sleeper.


    Jerry
    Maybe this is the reason for the big variability of folks experience with the HHSS with space blanket?

  2. #42
    Member gt7599a's Avatar
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    Talking Video of building a Down Differential Cut Bridge Under Quilt

    This is a video walk through of my attempt to make the down under quilt described by Grizz. http://youtu.be/_o6qcO43x2k So Dutch, here's your video, sorry it took so long.

    The original spread sheet is posted here & I've backed it up & added my dimensions beside Grizz's & posted it here (the original was marked as in the owners trash & I was afraid others might lose access to it)

    Below are the dimensions I used on the project

    # of baffles 6
    Baffle Height 3"
    Finished length 68"
    Finished head width 38"
    Finished Foot Width 30"
    radius 14"

    Thanks Grizz for the clear explanations.

    Mine kept me warm down to high 30's with sleeping bag for a TQ. I didn't actually sleep well but I rarely sleep well on anything that's not my bed at home. Next BSA camp out is less than a month away. Looking forward to it.

    Ed

  3. #43
    Member gt7599a's Avatar
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    Corrections to Trapazoid Bridge UQ DIY Spreadsheet

    I've made corrections to the Bridge Trapazoid UQ Spreadsheet. Specifically the outer shell dimensions would have been too narrow if you had more than 6 spaces (5 baffles).

    @wwk10 Thanks for catching the error. PM sent.

    I also added a note that filling the 2 side chambers with the full amount of down may be a good idea. GrizzlyAdams & I both used 75% in the side chambers but in my case at least that leaves 2-3 inches at the tops of the sides with no insulation. This is possibly due to overrated down, its allegedly 700 fill but I've got my doubts.

    Ed

  4. #44
    Senior Member stevebo's Avatar
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    Thanks for the spread sheet! So, have both links been corrected, ? (which spread sheet do I use?)
    FYI: If you want to know what type a certain bear is, sneak up behind it and kick it. Then,
    run like crazy and climb up a tree. If the bear climbs the tree and eats you, it's a black
    bear. If the bear just pushes the tree over and eats you, it's a grizzly bear : )


    Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me, either, just leave me alone.
    --unknown

  5. #45
    Member gt7599a's Avatar
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    the Google doc linked from my signature (probably not visible if you're using tapatalk) is the one I keep up to date.

    Ed
    DIY Quilt Spreadsheets: http://is.gd/pcEXXK
    DIY Project List: http://is.gd/pcsxfQ

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