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02-27-2019, 06:41 PM
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Join Date: Nov 2016
Location: Camas, WA
Posts: 370
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Instrument fans
Any arguments pro/con instrumentation fans in top of the glare shield. If pro, any recommendations on the fans?
Advanced is building my panel which will be Dual 5600's, 1 dynon comm, but planning for a Avidyne 540 in the future.
Thanks!
dan
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Dan Reed
Camas, WA
RV-7A - Slider in progress - N167DR (reserved)
Sitting in the paint booth, then final assembly/inspection time
2018 and 2019 VAF dues paid
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02-27-2019, 08:29 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Defrost fans
Pros...Also functions as defrost. Actually I don't know first hand. Mine isn't flying yet.
I bought two fans and grills from Steinair. My hope is that they tested them.
Two 3" holes and screw holes were cut before painting the glareshield. Fingers crossed.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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02-27-2019, 09:25 PM
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Join Date: Nov 2016
Location: Camas, WA
Posts: 370
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Thanks Larry- that is sort of my thinking too on defrost. I live in the PNW, so they may come in handy 
__________________
Dan Reed
Camas, WA
RV-7A - Slider in progress - N167DR (reserved)
Sitting in the paint booth, then final assembly/inspection time
2018 and 2019 VAF dues paid
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02-27-2019, 10:23 PM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by dreed
Thanks Larry- that is sort of my thinking too on defrost. I live in the PNW, so they may come in handy 
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I couldn't get a fan on the glare shield, as the 6 is shorter (my fan is from below for avionics cooling). The canopy only frosts up on the ground when temps are well below freezing. The moist air that I exhale condenses on the canopy. Opening the canopy for about 5 seconds clears it for a few minutes. Never experienced interior frost while flying all sorts of different temps down to -15.
Larry
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N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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02-28-2019, 03:00 AM
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Join Date: Aug 2014
Location: Bowie MD
Posts: 886
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I have four fans - two 1.5"x1.5" under the glareshield pointed at opposite sides of my center avionics stack, and two 1x1 fans to pull any hot air from below the shield to above. I doubt any of it is really needed, but my fans were from other projects so easy to do, and I have them on a separate breaker so I can kill them as necessary. Lots of 12v computer fans to be had of all sizes, and even the small ones will move a boat load of air, so dont get caught up on size, just look at CFMs. These are the little ones I used http://www.frozencpu.com/products/19...-189BK-2B.html
IMHO you can forget any auto type defrosting from whatever air is generated by the avionics, but as noted by someone else, just moving the air around above the shield may give you some benefit.
If you really think you want or need warm defrosting, then you ought to consider plumbing engine heat to the windshield (which will get you internal defrost, but prob not any external) or put in a hot plate if youre really gonna get after it meaningfully.
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Mani
Busby MustangII (FoldingWing) Pending DAR.
Don't be a hater; I'm a cousin with thin wings! 
N251Y (res)
Last edited by maniago : 02-28-2019 at 03:09 AM.
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02-28-2019, 05:20 AM
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Join Date: Dec 2006
Location: Colorado Springs
Posts: 576
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If a tipper canopy, make sure you locate far enough forward so you don't get interference where the frame and panel meet.
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02-28-2019, 08:54 AM
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Join Date: Nov 2016
Location: Camas, WA
Posts: 370
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Thanks All-
The vents and plates from Stein look very reasonable and install should be relatively easy at this point (slider). I did add a couple extra switches on the panel so I should be good there too.
Dan
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Dan Reed
Camas, WA
RV-7A - Slider in progress - N167DR (reserved)
Sitting in the paint booth, then final assembly/inspection time
2018 and 2019 VAF dues paid
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03-03-2019, 03:05 PM
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Join Date: Apr 2018
Location: bellevue,Nebraska
Posts: 20
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here is what I did
I mounted two 5" computer muffin fans with grills and filters all from amazon.
I originally cut the holes two far forward not sure what I was thinking so then had to add backing plate and move them aft otherwise I think it should work well. I will have to cut holes in whatever I use as a glare shield mat for these two fans and the 3 GPS antennas that sit up there as well as compass. Fans are controlled with a panel mounted switch labeled avionics fans. I have 2 GDU460, GTN650, GTR200, GMA245, GMC307, G5, IBBS back up battery, and VPX pro under panel so I think some airflow is a must.
The fan grills are 3 pcs, the fixed grilled that is bolted thru the skin and holds the fan and then a snap on grill with foam filters that are easily removable.
https://photos.app.goo.gl/cwGVSC4tWF4tD7VS9
Last edited by flyvansrv7 : 03-03-2019 at 03:08 PM.
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03-06-2019, 08:19 AM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
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Another vote for the computer fan(s). I pulled some out of some old HP servers but only installed one for circulation / defrost.

__________________
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)
Last edited by Raymo : 03-06-2019 at 08:22 AM.
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03-19-2019, 08:58 AM
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Join Date: Jul 2014
Location: Scotland
Posts: 24
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Does anyone have an ok indication from vans on the fan apertures in the forward cover ?
I?m planning the same and it might placate the authorities here
Cheers
Ian
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Fuji FA200 / 160 - sold
Sonex - Aerovee - Sold
RV7 in build
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