Re: Hiking in Skirts

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Article #121

#121

From: MB
Date: Sat, 07 Aug 2004 20:41

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Chris Townsend >
> I think we're talking about relative amounts here. I know there is
> some heat loss due to radiation, I just don't think it's very
> significant compared with the other types of heat loss. 

It'd be very interesting to see some figures, but I agree,
it can't be that big. Otoh, the cost of reducing the radiative
heat loss by making, say, a down jacket in white rather 
than black is zero. An alu coating would add cost and some
weight (impairs breathability?), but would weight-wise 
most probably be worthwile [Randall].

> Various Swedish companies like Fjallraven used to make tents with
> silver flysheets to keep out the sun during the long hours of northern
> summers. I didn't find when I tried one that it was noticeably cooler
> than non silver tents. (It was much darker - you needed a flashlight
> at midday). The coolest tents I've used were cotton ones (with bright
> orange flysheets).

I'm a bit surprized, as I would have expected that they'd be 
markedly cooler in hot sunshine. Just like the shiny tarp
works in the desert? But, I never tried a silver Pop-out, nor 
have I been hiking in desert.

A big advantage with the shiny alu-coating is that it also 
blocks UV. Stephenson continues to offer their tents with 
aluminized flies, but at a substantial surcharge.

At least latter Fj�llr�vens with silver-coloured flies had
the lower parts of the flies in some ordinary colour that 
wouldn't block light so badly. For the same reason Stephenson 
recommends choosing a light-coloured fabric for the ends of 
their tunnels.

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From: MB <*@*.*>
Subject: Re: Hiking in Skirts
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