Hammock Camping Re: Oh Boy, Cold Wars II, winding up!
- Some ideas and responses. I hope they help.
1. Cold wind DOES blow through closed cell foam. I have felt it.
Closed cell foam is just one more form of insulation where, to the
extent that cold air blows into it, it loses its ability to
insulate. This is both my experience and what is predicted by
Newton's Law of Cooling.
In other words, closed cell foam does not protect you from more than
a little bit of wind.
2. Thank you for pointing out a serious mistake that I made.
While it is true that convection results in stagnant air being less
that a perfect insulator, it is not true that that this prevents
stagnant air from providing any insulation. If obviously does. It is
definitely warmer in a two layer tent. Stagnant air definitely
provides what can be a significant amount of insulation.
In other words, if you have a windproof material surrounding the
hammock and hold it away from the hammock you will be warmer than if
you let the windproof material blow up against the hammock. And if
you connect this to a tarp above and a floor below (or just bring it
down to the ground) you will be warmer still. This can easily be
done using a diamond-shaped tarp, the two stakes already used to
hold the tarp down, and a cord at each end going around the bottom
of each tree. Condensation could be controlled with a couple of
vents at the bottom to let in dry cool air and a couple of vents
at the top to let out warm moist air, as Stephenson has done with his
Warmlite tents. Since this is very similar to his tents it is clear
that it would work. Netting protecting each vent would eliminate the
need for add netting over the hammock. The entrance could be through
the floor held up by velcro since any other design would probably
result in accidents and damage to the tent. It appears that this
would work very well with a Peapod or a thicker bag filled with down.
I don't like this idea because it is unnecessarily heavy and
But it isn't that heavy and it might be a good idea.
I spent a lot of time while thruhiking the AT last year ('02)
thinking up this design. It would be nice if somebody would try it.
Maybe it is a mistake to include the hammock as one layer of a two
layer tent and it would be best to build the tent as a two layer
Whatever, if you try it, please post a message on this list so I can
hear about how it works (or doesn't work).
3. One other idea. This would make it so you wouldn't need a separate
barrier to block the wind.
You could construct the hammock from three parallel pieces of
material going lengthwise. The two outer pieces of material would be
windproof, such as the 1.9 oz ripstop which is then silicon
impregnated. The inner piece would be breathable, such as uncoated
1.9 oz ripstop. It would be interesting to see if this is both
sufficiently windproof and provides sufficient fresh air to prevent