Ron,
I installed both 40 mm and 80 mm computer CPU fans and frankly, the 40s
don't move that much air. The 80s do better at venting the hot air out
of the panel. Some electronics get quite warm and I wanted to cool the
panel, not really defrost. That was a hopeful side effect of the
installation of the fans.
The first setup on 12AY I put the fans too far forward and they blow
into the windscreen support. To be honest, I can't even feel the air
flow moving up the windscreen, it moves sideways. That was a dumb
execution of a good idea.
On others, I move the fans as far aft toward the pilot as I can to pull
the Garmin 430 and Dynon Skyview heat out of the panel. They both get
pretty hot. I have found that the air comes up the windscreen, but is
not hot enough or fast enough in the winter to feel like a defogger, but
at least it moves the air up the windscreen. If you have an Ameriking
type cooling fan, one leg of that would be about as strong as my two
80s...
The Grand Rapids and Becker radios are pretty cool running and frankly
the panel only gets about 10 degrees warmer than the cockpit, so without
the heat and high forced air flow of an auto type defogger, I do not see
it as much help on a cold day at altitude with a quick descent to the
warmer air below steaming things up.
Sorry I don't have more info for you. It's just too hot here in
Florida. Even in the winter, although my canopy top fogs up and my
screen fogs for a second or two, they both clear once the inside and
outside temps stabilize.
Regards,
Bud
----- Original Message -----
From: rparigor@suffolk.lib.ny.us<mailto:rparigor@suffolk.lib.ny.us>
To: Europa<mailto:europa-list@matronics.com>
Sent: Thursday, July 04, 2013 2:11 PM
Subject: Re: Europa-List: windscreen de-fogging
Hi Fred
"If anyone can pass on their experience w/ what amount of airflow is
sufficient...or insufficient"
I chose to use four 12 volt mini fans. They are run off a 3 position
(low, high and off). If 2 are put in series it's low, and if run off bus
voltage, then high. Yes idea as a minimiist demister but also to get
heat out from under instrument module. You can find info on what I am
doing (I did quite a bit of fooling with different fans. There is also a
folder on that page "Panel cooling and demisting ideas by others."
http://www.europaowners.org/main.php?g2_itemId=27305
I am installing temp probes under the instrument module so will be
able to see temps.
Ron Parigoris
http://www.matronics.com/Navigator?Europa-List<http://www.matronics.com/N
avigator?Europa-List>
http://www.matronics.com/contribution<http://www.matronics.com/contributi
on>
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