Ira, I have a comparable system to keep my Blue Mountain
EFIS happy, although my fan has inlet above pax feet and
outlet through a dozen holes blowing on to pilot screen.
Moderately effective as demister, but EFIS starts to
complain when temps get up into vicinity of 35C (95 in
your old units). I have found that laying a layer of 5mm
neoprene with foil on one side, across top of panel (which
is painted dark blue for visibility) cuts out direct sun
heating and addresses the problem. So I have that Neoprene
sheet available in the back and use it intermittently in
exceptionally hot conditions
Regards, David Joyce, G-XSDJ
"rampil" <ira.rampil@gmail.com> wrote:
><ira.rampil@gmail.com>
>
> i have read the discussion on the issue of defogging and
>it appears that
> are no actual answers out there yet regarding airflow,
>temperature, etc.
>
> I will add my meager data to the pool
>
> My bird has a Blue Mountain EFIS 4 series which shuts
>down at temps
> above abt 144F. I have a 24 cfm fan in a convective
>tower directly
> above the EFIS leading into a 3 in louver directed into
>the plexi.
> On a 90F sunny day as so many local days are here on
>Long Island,
> without the fan, the EFIS will blackout within an hour
>of the plane out
> of the hangar, flying or not. The installed fan slows
>the inexorable rise somewhat
> say by 15 min to overheat. Clearly unacceptable cooling.
>However,
> it has actually cleared plexi condensation in two
>instances where it existed,
> in about 5 minutes (this was light grey mist, not
>dripping condensation).
>
> As I contemplate my move to much warmer clime, i will
>need to
> re-engineer the cooling. These little muffin fans are
>not likely to be useful
> even if ganged together. High velocity outside air is
>probably the best answer. Actual flight testing is
>needed.
>
> As usual, your mileage will vary
>
> Ira
>
> --------
> Ira N224XS
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=404012#404012
>
>
>
>
>
>
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