Bob,
I tried a computer fan, which sucked air in through the bottom of the instrument
panel and exhausted through windscreen slots in the top. It wasn't very
effective
and, when in flight, sucks through quite hot air that convects from the
surface of the footwell firewall. It did have some effect of demisting the
windows,
but marginal at the time needed, which was during taxiing when the aircraft
was still cool and not heat soaked.
This system was later changed to a cold air feed taken from the side of one of
the NACA duct cockpit ventilators. This air feed is routed through a short 3/4"
connecting SCAT to an exhaust tube behind the panel that squirts a jet of cool
(in the UK) air in the direction of the equipment behind the panel that need
it. This was more effective, and sounds more complicated than it actually is.
Duncan McF.
----Original Message----
From: bobhitchcock@icloud.com
Date: 19/04/2016 08:23
Subj: Europa-List: Avionics heat
Hi All
Any recommendations for keeping the transponders and radios in the panel cool.
Counter intuitively the replacement units need more cool air than early models.
Radios now indicate a bigger Watt from 8 to 15. And the Garmin mode S is up to
45 watt. The more the mode S is interrogated the harder it works and the hotter
it gets.
Who uses fans, who uses ram air? How do you route your solution?
Regards
Bob
Mono XS
|