Hi Tom
> maybe you had actually run the model
Run a numerical model? Nope. The number of assumptions required to set up such a model boggles the mind. Sorting out the constants or factors would be a PhD project! Field testing is simpler and has the virtue of being believable :-)
But yes, everything I review has been field tested. Fairly thoroughly too in most cases. (Better thank my wife who also does some of the testing for me.)
Sometimes, when the items are good, I lose them to my wife … :-) The manufacturer can really take a bow when she pinches an item off me.
> Aren't the tubes inter-connected?
Yes, but the effect of that is rather small. The interconnection is usually limited to a small cross-section at one or both ends. Unless you are trampolining all night, the amount of air passing into and out of the *edge* tubes is small. They inflate, and that's it. In general I sleep more or less on the middle of the mat, so I do not lean very much on the edge tubes. There may be some circulation between middle tubes of course.
> Have you tried it with the closed cell pad above and below?
I will confess that most of my field testing has been done with the CCF underneath. I tried putting the CCF on top a few times and found it awkward to manage, and apparently no better. My experience; others may feel differently of course. Also bear in mind that the POE EE 6 has some (not a lot of) insulation under the top surface. This insulation WAS noticeable. I think it fluffs up during the night.
> My quilt is flattened underneath me, so it's a fairly short line between me and the outside at the edge.
Ah, hum … In general my UL quilt stays on top of me except for the short bit at my feet, and it's a bit wider than most. Wide enough that I can tuck my wife under it as well if it is very cold. I can't say I have ever noticed any significant cold under me. OK, I'm a woose.
> Can't say that I ever have that much gear to pile along side, but you have stated
> before that you pack fairly heavy compared to some others on BPL.
I had better explain about that.
First of all, our weather can be VERY variable, FAR more variable than much of America. It can be >30 C in the middle of the day and yet hail or snow at night. This applies both in the Alpine region and also in the local mountains. It's due to geographic factors that can flick the major airstreams around – butterfly effect. So … needs must we include a little more by way of clothing. It would be rare that I am not carrying a thermal top and a Cocoon 60. But if it is warm at night that clothing stays in its stuff sacks. Extra weight I know, but you try cooking dinner with just a wet shirt and a cold-front storm outside. :-)
Second, as we are often out for up to a week at a time, there is usually a fair bit of food in small stuff sacks. It too makes a good barrier at the edge of the mat. We use everything!
Third, some of our local mountains are a bit on the cliffy side. (Up to 600 m of near vertical rock in fact.) We have to carry some rope etc both for safety and planned passes through cliff-lines. Often just 5 or 6 mm line though.
Yeah, it all adds up. Well, you should see what some of the local heavy-weights carry!
Cheers
Roger
