You can make things go below the outside ambient air temperature through
evaporation.  It isn't the wind that is colder, it is the effect the water
evaporating off the object - wind will accelerate this effect and will super
cool it.  This can be seen on chilly mornings were there is dew on the
windscreen and it is about +1 or +2C and then you start driving, that water
will freeze on the windscreen.  Aircraft also have this issue as well.

David Marshall

Fast Forward Automotive Inc.
4356 Quesnel-Hixon Road
Quesnel BC Canada  V2J 6Z3

http://www.fastforward.ca    mailto:sales@fastforward.ca
Phone: (250) 992 7775        FAX: (250) 992 1160

- Vanagon Accessories and Engine Conversions
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Due to the large volume of email  we  receive,  PLEASE  include  previous
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-----Original Message-----
From: Bruce Nadig [mailto:motorbruce@hotmail.com]
Sent: September 3, 2005 10:18 AM
To: mailinglist@FASTFORWARD.CA; vanagon@GERRY.VANAGON.COM
Subject: RE: Best placement for outside air temperature sender?

Howdy All,

Am I wrong on this or what?

" I want to avoid places like the grille as there is the possibility of a
super cooling effect if ... wind is blowing on it."

I wouldn't think that wind would make a difference on a temperature sensor
(even if it is wet). Fifty degree air is fifty degree air, right? And 100
degree air is 100 degree air, right?

Cheers,
Bruce
motorbruce@hotmail.com

>From: David Marshall <mailinglist@FASTFORWARD.CA>
>Reply-To: David Marshall <mailinglist@FASTFORWARD.CA>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Best placement for outside air temperature sender?
>Date: Sat, 3 Sep 2005 10:00:49 -0700
>
>I am in the process of installing a outside air temperature sender on my
>Westfalia.  The digital gauge requires a simple K or J type thermocouple
>for
>input.  Where is the best place to mount it to get the most accurate
>temperature in both town and highway driving?  I want to avoid places like
>the grille as there is the possibility of a super cooling effect if it is
>wet and wind is blowing on it.  I also want to avoid any heat sources like
>the radiator and such too.  I was thinking maybe in the forward section of
>the rear intake tunnel for the engine air...
>David Marshall
>
>Fast Forward Automotive Inc.
>4356 Quesnel-Hixon Road
>Quesnel BC Canada  V2J 6Z3
>
>Internet: www.fastforward.ca   Email: sales@fastforward.ca
>Phone: (250) 992 7775
>
>- Vanagon Engine Conversions and Accessories
>- Vanagon, Transporter and Iltis Sales and Importation
>- Electrical harness fabrication and customization
>
>Due to the large volume of email we receive,  PLEASE  include  previous
>emails when responding.
>This will allow us to read the complete dialogue in one message and will
>result in quicker and more  accurate responses.