I am skeptical of this. Where the light colored aircraft composite? This
would make a difference. The higher thermal conductivity of the AL would
make it seem much hotter than composites. Both aircraft must be
constructed of the same material. Were they?  Anyway off to look at my
heat transfer book to see what it has to say on this topic.

Alex Madsen

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of David Carter
Sent: Sunday, May 23, 2004 11:49 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Two problems solved, 2 more pop up...

I've noticed that shiney polished aluminum airplanes are quite hot in
the
sun, whereas white and light cream colored painted exteriors are quite
cool.
I used to think and "aluminum" finish would be best for reflecting heat,
but
I no longer think that.  I think the same situation would prevail inside
the
cowl.

David

----- Original Message -----
From: "Chad Robinson" <crj@lucubration.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, May 23, 2004 9:25 PM
Subject: [FlyRotary] Re: Two problems solved, 2 more pop up...


<snip> Given that the primary goal is reflecting radiated heat (rather
than
"real"
> thermal insulation) what's wrong with a coat or two of shiny silver
paint?
> It's not as good as polished aluminum but it's decent, and high on the
> reflective scale. Sherwin Williams (and others) sells a product called
> "Silver-Brite" that is marketed as "heat reflective" and "dry heat
resistant
> to 700degF". I haven't tested its adherence to epoxy so it might need
a
primer
> coat to help it stick better (it's designed for metal) but that's not
a
> painful step. In any event, it would sure be a lot easier to apply
than
either
> foil OR fiberfrax, especially to an oddly-shaped cowl.
>
> Unless real thermal insulation properties are necesary?
>
> Regards,
> Chad



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