Anyone seen the new omni-heat stuff, perforated mylar kinda. Seems like it could revolutionize tq's/uq's.
Anyone seen the new omni-heat stuff, perforated mylar kinda. Seems like it could revolutionize tq's/uq's.
FWIW, I think the car sunshades I've been using for years are likely made of this stuff with aluminized (sp?) mylar coated to one side.
Too funny, I just unpacked my daughter's birthday present for her: a new Casio keyboard. What was it wrapped in? PE foam, 1/2mm thick! If I cut open the bag, it's about the right size for a kids UQ! It's 46"x44" and weighs 1.2 oz... that's .77oz/sq yd
Last edited by JohnSawyer; 09-08-2010 at 23:58.
"Do or do not, there is no try." -- Yoda
Is it anything like Insul-Brite? it's a space blanket needle-punched between 2 layers of thin batting... about 1/8" thick or so.Originally Posted by ikemouser
"Do or do not, there is no try." -- Yoda
There's place by my house that sells big screen TV's. I think I've seen loads of PE in the dumpsters behind the store
I'm curious as to the R-Value of a 1/32 thickness of PE versus a 1/8 thickness. According to the following article http://www.worldlingo.com/ma/enwiki/...e_(insulation) there is a non-linear relationship between R-values and thickness... so what thickness is most effective? Is the R-3 rating of PE based on an inch after all? Are two layers of 1/32 PE with an air gap more effective than 1/8 inch PE? What is the relationship to CLO values? Ugh. After reading the article above I am more confused than ever!
At the end of the day I suppose that what will determine the utility of PE are real-world tests. After all, an R-value of 10 would be useless if the weights were prohibitive or if the material didn't breath and caused condensation problems. On the other hand inexpensive PE may just be the latest greatest thing!
I was hoping that people would find PEF sources, as an alternative to Insultex! Dumpster diving hammock hangers!I think I've seen loads of PE in the dumpsters behind the storeWhat does it mean?
Because of the issue of fit, it is construction, as opposed to thickness, is the controlling factor. With thin closed cell foam insulation (IX or PEF) HammockForums.net folks have discovered that by insuring a tiny separation between layers, and using a differential cut to avoid over tightening, the heat resistance of two or more thin layers can be maximized.
Just so... we make the thinnest, lightest UQ possible, and test for it's practical limit. Then we see what is the incremental effect of adding thin layers, both in construction and by nesting.
- MacEntyre
"We must, indeed, all hang together or, most assuredly, we shall all hang separately." - Ben Franklin
www.MollyMacGear.com
Here's an idea that came to mind...
Since an air gap is desirable between sheets of PE why not combine it with a synthetic such as Climashield? Sandwich a layer of Climashield between 2 sheets of PE, or maybe even PE / C / PE / C / PE?
Obviously more bulky than down, but I bet it would be warm, and of course dry out faster than down.
I don't have an UQ yet...just thinking about it.
It doesn't need to be much... we shoot for 1/16" to 1/8" gap.
However. your idea is essentially the same putting a PEF or IX UQ on the outside of any other UQ. It works very, very well!
- MacEntyre
- MacEntyre
"We must, indeed, all hang together or, most assuredly, we shall all hang separately." - Ben Franklin
www.MollyMacGear.com
How about Tyvek for the breathable air pocket in the middle? Does it breath enough?
Folks, you are working on a problem that has already been solved!
It doesn't need to breath... don't know where that came from.
Pleats and differential cuts are two methods of creating a tiny gap between layers. Molly Mac Gear uses both. It is not necessary to add any material in the gap.
- MacEntyre
"We must, indeed, all hang together or, most assuredly, we shall all hang separately." - Ben Franklin
www.MollyMacGear.com
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