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09-11-2017, 10:10 AM
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Join Date: Mar 2017
Location: Glendale, CA
Posts: 253
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Avionics Cooling fan
What have you guys done about that? I am at that point so trying to get ideas. I love to use the cyclone 21-3 but the price is pretty steep for a fan!
Got ideas and pics to share?
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09-11-2017, 10:20 AM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
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I have a few cooling fans out of old HP servers that work great. They run on 12 volts, are light and inexpensive. Mine comes on with the nav lights.
I have several extras if you'll donate $5 to VAF and pay shipping (USPS small box or padded envelope).

__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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09-11-2017, 10:20 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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I didn't install one. My GTN 650 has a built-in fan, but I don't think that in most instances an external fan is required for today's avionics. However, I have nothing factual to back that assertion up.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
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09-11-2017, 10:48 AM
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Join Date: Jun 2006
Location: Delaware, OH (KDLZ)
Posts: 4,196
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My Garmin transponder was the other thing in my panel that needed a dedicated fan port. I added two standard computer fans on the glareshield. They solve two issues. The first is to remove hot air trapped behind the panel. The second is function a defroster when the temps start to drop.
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09-11-2017, 02:07 PM
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Join Date: Feb 2005
Location: Minneapolis
Posts: 2,473
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Many of the modern avionics and EFISes have their own cooling fans in or on them, and in addition to that perhaps the most important thing is to have some sort of vent holes in the glareshield (or even a couple muffin fans). That should allow that dead space between the main panel and sub panel to be ventilated and kept at a good temperature, so everything should be good (as Bob noted, those glareshield fans also work as defrosters too).
Just my 2 cents as usual!
Cheers,
Stein
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09-11-2017, 11:53 PM
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Join Date: Mar 2017
Location: Glendale, CA
Posts: 253
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I guess I forgot to mention that mine is a tip up canopy so fan placement on the glare shield is not quite the same!!
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09-12-2017, 02:17 AM
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Join Date: May 2010
Location: Fleming Island, FL
Posts: 162
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I believe it
was Bruce Swayze that did an excellent job of describing how to mount fans in his tip up glare shield. Check his build log website for details. 09-30-15 entry.
__________________
Con Kelley
RV7
Empennage and wings need tips
Fuselage kit "finished" (for the moment)
Finish kit and FWF in progress
Hartzell CS
Aerosport Power IO-360, Dual Pmags, AFP FM200 FI
Hangar construction at 7FL4 nearly finished.
Home construction at 7FL4 about to begin.
C-172 at KCRG (sold)
C-150 at 7FL4 (sold)
www.mykitlog.com/cakelley
www.1379.eaachapter.org
Last edited by Wingnut : 09-12-2017 at 02:20 AM.
Reason: Added date of entry.
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09-12-2017, 05:35 AM
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Join Date: Jul 2012
Location: n. wi
Posts: 778
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i made a heater with an oil cooler core and these fans.
search ''pancake fans'' on ebay and there are dozens.
__________________
Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12. in the hangar now as of 10/15/19
RV-12 kit as of 9/13
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09-12-2017, 05:53 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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Quote:
Originally Posted by SteinAir
Many of the modern avionics and EFISes have their own cooling fans in or on them, and in addition to that perhaps the most important thing is to have some sort of vent holes in the glareshield (or even a couple muffin fans). That should allow that dead space between the main panel and sub panel to be ventilated and kept at a good temperature, so everything should be good (as Bob noted, those glareshield fans also work as defrosters too).
Just my 2 cents as usual!
Cheers,
Stein
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I should have stated that I also have 2 glaresheld vents too.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
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09-12-2017, 08:38 AM
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Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,653
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When Stein speaks avionics, we should all listen.
My -6A has a fan but no venting in the glare shield and pooled heat can get to around 150 degrees on a hot day. The -10 will have vents and has two fans to service the ports on the G900X components and the LSE ignition boxes. Those fans are mounted on the sub-panel between the G900X racks and are updraft to draw from cooler air below the panel and any air not forced into the cooling hoses will be sent up toward the glare shield vents. Don't count on your avionics having fans and, even if they do, you still want to be sure air moves from under your panel so you're not 'cooling' your avionics with hot air.
And, while the -6A panel is out this winter getting updated, I will rectify the dead air situation behind the panel.
__________________
Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
http://www.mykitlog.com/flion/
EAA Technical Counselor #5357
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