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  1. #1
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    Rate my TQ(temp)

    Almost done with a down TQ. Thought I'd solicit opinions on (roughly) how cold it will take me.

    Specs:
    Momentum shell
    48" x 65" w/sewn footbox
    2" baffles
    12oz of 800+ down from StormCrow

    I'm thinking at least low 20s maybe teens in a pinch. Most of it's use will be 30-50F.

    So how far do you think it will go?

    Jbo

  2. #2
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    I know. Pics. Will post some when I'm done. Just finished sewing baffles last night. Will order the down shortly.

    Jbo

  3. #3
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    Rate it yourself.

    Rate it yourself., hahaha.

    Seriously each person is different so you need to do some trail and error to see how this quilt works for you.

    Here are some rules of thumb I got from another website that have worked

    Air Temp......insulation (top loft)
    40F...........1.5in
    20F...........2.0in
    0F..............2.5in
    -20F...........3.0in
    -40F...........3.5in
    -60F...........4.0in

    Of course heat is also lost through warm air leakage and through the insulating pad below you.

    And of course individual's sleeping metabolisms vary. Women supposedly sleep 5-10F colder than men, on the average.

    Features like draft tubes and collars make a difference.

    So treat the above numbers as a minimum.

    Lofts I have measured on some mummy bags:

    Rated Total loft (top/bottom)
    20F........... 5in (3in/2in)
    0F............. 6in (4in/2in)
    -20F.......... 8in (5in/3in)
    -40F........... 10in (6in/4in)

    Figuring out the minimum insulation you need for a given temperature is trail and error.
    Love my JRB BMB

  4. #4
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    That's a good book answer, thanks. But I know people have good general ideas too based on their experiences. Looking for those as well.

    My 20 degree assumption is based mostly on specs and fill weights of the GoLite and StormCrow TQs.

    Jbo

  5. #5
    Senior Member animalcontrol's Avatar
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    Quote Originally Posted by tjm View Post
    Here are some rules of thumb I got from another website that have worked

    Air Temp......insulation (top loft)
    40F...........1.5in
    20F...........2.0in
    0F..............2.5in
    -20F...........3.0in
    -40F...........3.5in
    -60F...........4.0in

    So treat the above numbers as a minimum.

    Lofts I have measured on some mummy bags:

    Rated Total loft (top/bottom)
    20F........... 5in (3in/2in)
    0F............. 6in (4in/2in)
    -20F.......... 8in (5in/3in)
    -40F........... 10in (6in/4in)

    .
    Personally (not doubting you at all) these seem VERY optimistic. I would never attemp a 0*F hang with 2" of loft under me regardless of the thickness of my TQ
    I would review the JRB (or any other TQ/UQ sellers) website and see what they recommend. JRB rates 2.5" baffles as a 25-30*F quilt.

    YRMV...everyone is different. Error on the cautious side!
    "Every day is a new day to a better future"
    "Of all the things that matter, that really and truly matter, working more efficiently and getting more done is not among them." ~ Mike Dooley
    "What if I told you that you couldn't have anymore of anything... No more friends, no more money, no more anything, until you first got happy with what you have?"~ Mike Dooley
    "The only true wisdom is in knowing you know nothing." ~ Socrates

  6. #6
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    Personal experience (New England)

    Yes, I agree that those values in the table are a minimum value.

    Personal experience (New England)

    My Hudson River works well as a TQ in the summer with a BA insulated aircore in the pad sleeve

    My Hudson River works well as an UQ in the Late Spring and Early Fall with a 30 deg sleeping bag as a TQ.

    My Old Rag Mountain works well as an UQ in the Early Spring and Late Fall with a 30 deg sleeping bag & my Hudson River as a TQ.

    This past weekend I hit minus 7 deg F with the HR and ORM layered as UQ, BA insulated aircore and z-rest in the pad sleeve & I nested two 15 deg F sleeping bags as a TQ. I was toasty warm and could have handled colder temps in that set-up.

    Hudson River
    L (in.) W (in.) T (in.) Wt. (oz.) Down Wt. (oz.) Down Fill Power
    78 48 2.5 20 11 800+
    Old Rag Mtn
    L (in.) W (in.) T (in.) Wt. (oz.) Down Wt. (oz.) Down Fill Power
    78 48 3.5 25 15 800+

    So I think your 2" thick quilt would work for me as a TQ down to about freezing and as an UQ down to about 40 deg F

    Hope that helps.
    Love my JRB BMB

  7. #7
    Senior Member animalcontrol's Avatar
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    Quote Originally Posted by tjm View Post
    So I think your 2" thick quilt would work for me as a TQ down to about freezing and as an UQ down to about 40 deg F

    Hope that helps.
    +1 same for me!

    ps-nice job on -7*F!!
    "Every day is a new day to a better future"
    "Of all the things that matter, that really and truly matter, working more efficiently and getting more done is not among them." ~ Mike Dooley
    "What if I told you that you couldn't have anymore of anything... No more friends, no more money, no more anything, until you first got happy with what you have?"~ Mike Dooley
    "The only true wisdom is in knowing you know nothing." ~ Socrates

  8. #8
    Senior Member BillyBob58's Avatar
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    Quote Originally Posted by animalcontrol View Post
    Personally (not doubting you at all) these seem VERY optimistic. I would never attemp a 0*F hang with 2" of loft under me regardless of the thickness of my TQ
    I would review the JRB (or any other TQ/UQ sellers) website and see what they recommend. JRB rates 2.5" baffles as a 25-30*F quilt.

    YRMV...everyone is different. Error on the cautious side!
    I'm sure he is referring to a zero rated mummy bag rated for ground use. Which of course would normally be used with a thick pad for ground insulation and cushioning. In which case most of the 2" loft underneath is crushed by your weight and not real useful anyway. Not uncommon for bag makers to put more insulation on top for that reason. OTOH, 4" of insulation on top ought to be warm well past zero.

    What I think is a bit optimistic- especially with a quilt- is the top table. Two inches of down good to 20? Probably not for most folks unless augmenting with plenty of warm clothing. I always thought 2.5" TOP was the standard for 20F, with down anyway?

    My Golight Ultra 20F is rated 2.5" top. I think it comes pretty close on avg to reaching that, though it certainly does not seem overstuffed. (it weighs ~21 oz) I find it pretty marginal at 20F without plenty of warm clothing, compared to some(but not all) 20F bags I have used. It seems to me good by itsel at more like maybe 25 or 30. Course, folks vary!

    JBO, I see you have 2" baffles. Is it "overstuffed"? IOW, what is the actual loft between baffles? If it is 2" max, for me that is more like a 30-35F TQ, with just long Johns.

  9. #9
    Senior Member animalcontrol's Avatar
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    Quote Originally Posted by BillyBob58 View Post
    I'm sure he is referring to a zero rated mummy bag rated for ground use. Which of course would normally be used with a thick pad for ground insulation and cushioning. In which case most of the 2" loft underneath is crushed by your weight and not real useful anyway. Not uncommon for bag makers to put more insulation on top for that reason. OTOH, 4" of insulation on top ought to be warm well past zero.
    OOHHHHH, yes, your right. and that would make perfect sense.
    (see the light bulb that just popped on)

    OK, I've messed up enough threads today...my keyboard is officially put away as to protect the innocent!
    sorry tjm!!
    "Every day is a new day to a better future"
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    "The only true wisdom is in knowing you know nothing." ~ Socrates

  10. #10
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    Actual sewn baffle material is 2". Significantly overstuffed at about 30%. An ounce is cheap insurance to me.

    Jbo

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