Sorry Brad if this comes across as harsh but there's a lot of misinformation in your post and I'm a geek, I can't help it.
>The only R-value from the NeoAir is the space blanket inside. The baffles are just randomized poly scrim, if you will... looks kinda like a fabric version of OSB board. Really just to hold the pad together.
The baffles are actually where most of the insulation value comes from. They stop convection currents forming within the mat. The marketing on the NeoAir box is misleading, the fact that the baffles are reflective is a minor enhancement, but people love them some bending red arrows.
>People on the site rip on emergency blankets all the time, but do so mistakenly. E-blankets can provide significant insulation, tho particularly when formed into a bag. I have been in several situations using an e-blanket and have found them to be remarkably warm.
Yes, they keep you warmer when formed into a bag because they then trap air. They are also a vapour barrier so stop evaporative heat loss.
>I have been researching for an article on exactly this subject. One study I found actually reported a value of up to R-6 for e-blanket. For those interested, I kinda dropped the research a while ago & will have to dig thru notes to find references, or just wait to see if article materializes.
This is not possible unless the blanket was formed into a multilayer corrugated blanket like a Blizzard Pack, in which case it is again trapping air.
>Heat loss occurs in a bunch of ways; we all know that. Radiative heat loss in temperate surroundings ranges from 45-65%. Yup, you read that right.
Only if you've already reduced the other sources of heat loss to a minimum
>As many here know, I have a NeoAir and like it quite a bit... but find that it's far too cold of a pad for temps into the low 40s or lower. I think that the reason the pad isn't as warm as numbers seem to indicate it could be is the fact that it is still mostly an air mattress and, just like a "pool toy" air mattress will still have significant heat loss via air movement thru the pad.
Agreed, the NeoAir's baffles help, certainly better than a plain air bed, but they are not as effective as foam or down
>On the last major trip w/the pad I ended up wrapping myself in a space blanket. I gained at least 20 degrees of perceived warmth. Full circumferential wrap of the e-blanket stops the majority of radiative heat loss, sure, but also stops evaporative heat loss. Oh, no real convective heat loss then, either.
Exactly, it's the evaporative and convective (and just plain wind chill) that are the biggies. If radiative was important you wouldn't have to make sure that the gaps were filled to feel a benefit because radiative heat moves in straight lines.