Hammock Camping Re: Oh Boy, Cold Wars II, winding up!
>the physics of the materials does not allow the air molecules in thatYour description of closed-cell foam is great. The question I still
>wind to penetrate the foam.
have is about how effectively the foam blocks the wind. For instance,
Tyvek blocks the wind but the commercial version of Tyvek blocks it
seven times better than the home version.
I'm going on memories from last year which may not be totally
correct, but what I am certain about is that the cold came through
the pad. To some extent this would be caused by the fact that the
wind prevented the air that is right up against one side of the pad
from retaining a significant amount of heat and therefore reduced the
insulating value of the combination of pad and surrounding air. My
guess, based on the extent to which the pad lost its ability to
insulate, is that it is also because the cold wind managed to
penetrate at least part way into the pad.
>My experience with thin pads is that whenever wind is blowing theHow do you explain what sounds like a significant loss in insulating
>skin on my back cools and it may even feel like the wind is coming
>through the pad... But it is not. I have proved that by creating
>an air tight chamber out of closed cell foam. Even under pressure,
>air does not get through the closed cell.
value of your chamber of closed cell foam when it gets windy?
Do you really think the loss can be fully explained by the removal of
the dead air that surrounded the chamber before the wind increased?
>Your idea of a tent like chamber beneath the hammock has a lot ofThe tent that I described has approximately the same design and
>merit in that it can keep cold air from blowing across the hammock.
>However, it has the problem that it can be a large volume.
volume as Stephenson's Warmlite tent (but without the poles). In my
experience and based on the measurements of others I am sure that in
cold weather it is considerably warmer inside than out.
But I am not going to build one, for the same reasons that out west I
use a tarp instead of a Henry Shires tarptent. The alternative has
definite advantages, but I prefer a simpler lighter shelter that does
less to separate me from the surroundings.
What do you think of the idea of building a hammock from three
parallel lengthwise strips of material, with the middle strip
uncoated? Do you think it would work to both block the wind and
prevent significant condensation?
Thank you for your response. --David